ChalknCover

Yeah, my money is on the plugs, but then again, I could be wrong, sometimes it depends how well it was taken care of. When was the last time it was tuned up? New plugs, fuel filter, and such? If you don't know, then do it all so that you know it was done and when.

I would do plugs, fuel filter, trans flush (not just a drain and refill), check the cooling system, air filter, if it is a reuseable, then just clean it.

budders

same thing happened to me replaced cop and it ran amazing.

smitty2919

sometimes its a toss up between COP and spark plug....unless visual damage on either.

pull the COP and test them with a voltmeter to rule them out or not: see Post #2 in bold

https://mustangforums.com/forum/4-6-...lp-needed.html

saved me $100 in 2 coil packs doing this, once you install them you cant return them

'96-WHITE-GT-CONV-STICK

I found out the problem, 1-bad fuel injector. small crack in factory 14 year old exhaust manifolds.

5sp04GT

time for headers ha ha