Hi,
I'm new to this forum.
I've had problems pointing to a bad COP.
I bought 8 new COPs from Global off of ebay.
I had a garage install them. Although it's better, I still have same problems...Bad cop? Or bad install?

Symtoms are, vibrations at certain rpms (under load)..Rough idle..
Like I said I do have more power and idle is alittle smoother, as is the vibrations...But still there..

 

Is the MIL Light on? have you had it scanned for codes? How old are the spark plugs, were they replaced?

 

Yeh we need a bit more info lol

 

I just changed my COPs and plugs at the same time. First off I find it hard to believe that a good shop wouldn't have recommended changing the plugs then.

After I changed mine I'm still havin
g the same issues. It fixed my misfire but still not running great! I then put a new idle air control on and another big improvement but still not great. So now a new alternator and air intake system. We'll see what that does. If not then fuel system here I come.
btw 2001 f150 5.4 4x4 Screw