I have an '03 4.6 4x4 screw, 101,000mi, plugs done by dealer
7,000mi ago. was running fine, turned it off, went into store, came
out, started it up and could tell immediately something was wrong.
a bit of a "miss" like it's on 7 cylinders. when in Park, slowly bring revs
up and at 4400rpm a miss/burp/cough [take your pick] occurs.

Is this what every one refers to went speaking of replacing the COPs?

 

no need for the bolded font here.

any check engine lights? its time to change the COPs out anyway unless its been done before. but yea, sounds like a COP problem

 

mine did a similular thing today, I was crusing down the road and it started to buck, then it got worse and it misses bad when i accel from a stop the truck just shakes, no check engine light tho, how else could i tell what cylender is missfireing?

 

Why the bold print?

 

He is yelling at you.

 

DAMNIT! - Not another one

 

I had that problem with my truck, new plugs and all new COPS fixed it. hope that helps

 

Anyone that 'slowly' brings a motor to 4400 rpm has go to be out in left field some place.
What a way to test!
A miss at idle or low rpm is still a miss at 4400 rpm. What did you learn from it?

 

Sorry, didn't realize it was on


Ha,Ha, I learned that it misses at 4400 rpm. If it was a motorcycle I'd have
better luck, I don't know much about computers and engines--thats why I like this site--I always get an answer and a good laugh--Thanks guys