Kept getting the miss fire code so I put new plugs in. Platinums and gapped them to .054 and now the problem is worse seems like! Put new wires in and a new coil pack and it still stumbling!

I have no power on acceleration and it sounds like its missing a cyl I cleared the codes when I did the coil pack and now I am not getting any codes at all!

It stumbles right in the beginning and after I would estimate 5k it seems to run smooth. I let it run for about 30 minutes and no codes!

 

i have a 2003 ford f150 it is shackin when i hit the gas petal...i replaced the spark plugs about 6 months ago....the check engine light is not comin on. what else could it be?

 

what year and what engine is in your truck?