notastockdohc

04 fx4 screw 5.4 3v. Okay so say I'm cruising down the interstate and I need to pass or get around a car I will push gas to floor and it will hesitate then down shift but jerk fairly hard before accelerating. Then again sometime I go to pass push down to the floor and it will refuse to down shift? What gives here no cel ect

Pausnsk

When was the last time you had the spark plugs changed? I had a very similar issue with my truck - changed the plugs - problem solved.

notastockdohc

Less than 10k miles ago cool packs are less than 4k old. Feels like its a programming or drive by wire error???

notastockdohc

Any other ideas guys

djfllmn

iTrader: (1)

if you are going down the road and hit the o/d lock out button do you get the same result?

PerryB

Fuel filter? I just changed mine due to a hesitation on acceleration and it solved the problem.

notastockdohc

^^ I played with the od today I let it shift through all the gears got her about 65mph with od on the I hit the Od off button it instantly shifted to the next lower gear it did do s slight jerk but only once I did this off and on for about 5miles I even click od of my let it shift into next lower gear then I waited a few seconds out it to the floor and it down shifted once more so idk lol feels fine now. I have noticed say you are going down the road 55mph and I come to a sharp curve that requires me to roll out of the throttle all together and as I start coming out of the curve I try to throttle back up and it will hesitate almost like it stalls out for a few seconds then it jerks and resumes throttling up and getting back up to 55 I will try the fuel filter any special tools needed and where is it on this truck under the spare tire?

Summers22

iTrader: (2)

A tune will cure it all. If your plugs and COP's are good, change your fuel filter. I changed plugs, COP's, fuel filter, cleaned MAF, cleaned throttle body, changed fluid and filter in the transmission and it still did it. Got an Edge Evolution and it was INSTANTLY gone. There is numerous threads on the stock tuning causing hesitation on hard/sudden acceleration.

notastockdohc

Okay so I buy the edge who puts the tune on it? Plugs changed cop changed, mass air cleaner and tb cleaned in the last 4 months. So I will try filter then if that is a no go I will try a tune I've always used sct software

Summers22

iTrader: (2)

You can use SCT. I am just familiar with Edge, have had a Evolution for the last 12 years or so. PHP is the only one who can tune the Evolution and that may be changing. Many can tune a SCT so that may be the way to go.