fordtruckjdb

Ok, I know I will probably take a lot of heat for this but here it goes. I have a 2004 F150 screw with 150K miles on it and have never had the plugs changed. I have an issue with my truck seeming to misfire at times. I can be cruising along at 65-70 mph and if I go to give it a little more gas the truck starts shaking and stuttering-this will stop if I let up on the gas or if I really increase the gas and the RPM's increase. It only does it while I am at a cruising speed. Does this sound like the plugs are needing changed? I change the oil every 4K miles, have flushed the transmission twice, replace the air filter every 10-12K miles and change the fuel filter every 60K miles. After reading the threads here and the nightmare with all the plugs breaking I am tempted to have someone else do it. In any case, what are the best plugs to put in? I appreciate any help and I would greatly appreciate that if you think I am a dumb### please don't say so...thanks.

abgarza

When I bought my truck used, I dreaded changing the plugs. It had 130k miles on it, and the Oasis report AND carfax showed no instances of it going into any dealerships for ANY service. It took me about 3 days to get up the courage, buy the new Motorcraft plugs, get the spark plug extractor from Oreilly, and begin. Lucky for me, someone had already changed the plugs and none broke, so I returned the extractor. I was lucky. Sounds like yo are going to have your hands full, but what I understand about the extractor tool is that is works great. Buy it, use it, and then sell it off because you are not going to need it again.

It will save you quite a bit of money from what I understand.

g8rfan

I am in the process of changing my plugs (7 of 8 so far) at 97K. I followed the TSB to the letter and didn't break a single plug. My only problem is that #3 had serious corrosion from something (???) leaking in the plug cylinder and the plug nut has completing rounded off. I ddin't notice how much buildup was actually in the cylinder and therefore didn't know that the spark plug socket wasn't fully seating on the nut. Make sure you check that one before you start to torque on it. I'm waiting on a Snap-on deep-well nut extractor to be delived and hopefully I'll be able to get that plug out myself!!

Chris0

I had the same problem with my truck,(04 supercrew w/89k on it). I took it to the mechanic and he said to keep driving it until the light came on then he could find out which cylinder had the problem. For some reason it stopped misfiring. I can't decide if I should just try and change the plugs or leave it.