txresq

I just wanted to throw in my experience for anyone trouble shooting this problem. Mine is a 2004 5.4 3V triton and my coils/plugs were only 2 years old, so I was positive my transmission was responsible for the shudder. I dropped the pan and it was clean with minimal discoloration. Filter looked fine as well. I figured the problem was internal, so I followed the transmission fluid exchange procedure, by disconnecting the return line and slowly changing out the entire capacity of the atf. Dropped pan again afterward and replaced filter then topped it off. Seemed better at first, then shudder returned worse than before, but still no CEL. After a few weeks it got really bad and finally threw 2 codes: Cylinder 4 misfire and engine running lean. I broke down and changed the fuel filter, coils, and plugs. I cleaned the throttle body and MAF sensor, then cleared the trouble codes. I started it up and it ran better than new! It's been a month and it still runs perfectly. The last set of plugs and coils were motorcraft, so I'm not sure why they didn't last, but the moral of the story is: coils and plugs are responsible for a ton of different and seemingly unrelated problems with these trucks even though there may not be a trouble code.

KyleWell

I just got my truck back today. I changed the fuel filter myself (metal tool is much much better than cheap plastic). Got a great deal, $250 flat for the plug change. They said 4 broke and the passenger side last one closest to firewall took hours to get out, so I am glad I did not tackle this myself. I drove it on the freeway and roads to try to make it shudder, and thankfully it did not. Thanks to the forum I figured out the problem, and now I feel like I have a brand new truck.

04supercrewcab

so everybody keeps saying a shutter sound.... now my truck is doing it and it sounds like i hit the turtles on the road way for a second and then everything is find, is this the same that u all are describing?

macbell7

Mines doing the same thing, get to 45 mph or 60 mph coasting and apply gas then shudder happens if going up hill. I've got 139K miles so I'm sure my plugs need to be changed either way.
I've learned to feather the pedal when I'm accelerating so it upshifts without much notice when I feel it will happen and it doesn't do it.

Especial86

iTrader: (1)

I got the same slight miss too.. I swapped out the coils on one side of the motor (driverside) which helped, but didn't nail it.. I'm about to put a whipple supercharger on my truck so swapping to in some fresh sp515 plugs is not high on my priority list.. I'd rather put my HT0 plugs in, but they are a colder heat range plug and will be prone to carbon fouling without the supercharger installed. I already bought some fresh high flow cats to install since my slight misfire is likely not going to bode well for my factory cats... If you guys are misfiring try not let go on too long. It will undoubtedly melt down your cats, and cost you more money in the end..

cfish

tsresq: i had a cylinder 6 misfire, changed all the plugs, still had obd code for that cylinder. bought a new injector for that cylinder finally got the code out of the way but it was still shuddering. swapped coil packs and no fix. cleaned out MAF and throttle body and it still shudders when i accelerate and while cruising. i am losing my mind over this truck because i am not a mechanic and am trying to keep away from a hefty shop bill. the more i drive the worse it gets. i stopped driving it yesterday so i dont damage anything internal. any suggestions?

jamie930

have you changed the COP boots and springs? I had a misfire, about 20k miles after plug change. Changed the boot and springs no problems since

STANDARD MOTOR PRODUCTS Part # CPBK240 is a set of 8. I think they are a OEM supplier seeing how the boots had the same mold marks and mold numbers as OEM

Weekender

2007 F150 FX2 SCAB, 5.4L Flex. Occasional bucking and hard shifts on light throttle up an overpass, OD or not in OD. Yesterday we had our first real ice storm and there's sleet and slush everywhere. Truck ran fine yesterday but today once I hit 40+ on the highway the vibration was terrible. I thought I had a chunk of ice on the driveshaft, or the rear end was chattering. It was 19 degrees out.

The hwy was clear and traffic was bearing down so I punched it and it cleared up instantly. I expected to see a bunch of ice fly out from underneath in the mirror, but there was nothing.

The truck has 114,000 miles, I have new plugs and a Lisle tool, sitting on the bench in the garage.

Time to change them out and also go ahead with a trans filter, fuel filter and check that the FPDM isn't wearing against the frame.

From what a bunch of you have posted, the plug change alone will likely fix the bucking problem.

Weekender.

MHOWELL34

mine even does this a little, dont worry about it if its not getting worse, nature of the beast. lol

I see you are changing plugs, thats a good start tho.

AzRider

For the past 3 month I've been experiencing similar symptoms to the ones described in this thread. Mine is a 2006 5.4 3V XLT. Once the truck is in top gear, on light acceleration, it felt like the transmission was bucking. Also, it had no passing power and would bog if I stomped on it. It really did feel like a transmission issue and wasn't throwing any codes. Since I had replaced the plugs about 6k miles ago, I temporarily ruled them out as a cause. After doing some research I read an article on carbon-tracking, so I decided to start with a new set of COP boots ($25). Swapped out the boots with dielectric grease applied to the inside surface and now engine runs as smooth as butter. No more bucking or bogging. Glad I researched this before going after a transmission problem.

Hope this helps anyone else experiencing this issue.