jlsmith250f

I have a 04 f150 fx4 with 5.4l. It has 111,000 miles on it. I bought it with 72,000. Currently when the engine is under a load it starts to buck. Not knowing how well it was maintaned before I got it, I dont know if I should look into the ignition or the tranny. Anyone experiance any such problems ? How did you fix it ?

militaryrednek

turn your overdrive off while towing/under load

gforceman

Plugs. And or coils. Mine did the same thing .. i changed the plugs where bad all good now

jlsmith250f

Been thinking about changing the plugs. Hope that fixes it. And I'm not towing anything. Motor gets under a load and it starts to buck. Thought it might throw up a code but check engine light hasnt come on.

Masi1926

Thread usually always starts out this way, and we've all found that 99% of the time it'd the coils and or plugs.

razzle

Mine did the same thing. Changed the plugs and its running like new.