Got an 86GT with Edlebrock performer II's Trickflow Street Heat upper and lower. Tremec TKO full MAC 2.5 with o/r x-pipe. I've been having this issue for a couple months now, and i've almost run out of hope. I was having an idle problem when it was brought to my attention that I had a large lower intake leak. It was repaired and the idle problem vanished. Here is the issue. I don't have any clue what type of cam is in this car. Although I know it's not stock, I don't have the specs. When my distributor went back in, my mech timed it to normal 5.0H.O. specs. I twisted the cap a little and seem to get it right. A new problem now exists. My car seems to "fart out" between 3,000-4,000rpm. Plugs should be 1yr old by now. The only thing i can think of is the timings off. How can I set proper timing if I don't know what kind of stick is in it? Please help. I'd like to cruise to bosto this weekend with t-tops down.

 

set it at 10 and go up from there most run it at 13 or 14

 

what plugs and what gap ?

throw the platinums away if that is what u have.

if not, gap them all to about .046" and see how it runs.

it's not timing, unless your waaaaaay off. i agree just put it on 10* for now and call it a day. your cam has irrelevant

 

Motorcraft pre-gapped. had ngk's removed them two years ago for the motorcraft. so actually plugs changed two years ago. I needed to cross reference the motorcraft plugs with the serial number from the ngk's. the stock plugs were too big in diamater and to short to fit in my edelbrock heads

 

If there pre-gapped, they could be Platinum plugs. I would recomend Copper plugs.

 

I just purchased CHAMPION COPPER PLUGS (I know, CHAMPIONS are not loved in the FORD community, but that's what edlebrock site said to use) How should I gap them? Normal 5.0HO suggests .054?

 

gap them to what edelbrock says to use. ford specs are no longer valid when you don't have ford parts sitting on top of the block.

 

Bastards from Edelbrock had my on hold for 30mins to tell me "um... use factory gap specs.) Now i'm not sure what the hell to do. I've seen people suggest .030 .040, also saw 302HO=.054 or what fellow poster (forgot your name bro, sorry) suggested @ .046. Question how much difference could .008 (.046-.054) make? Seems minute.

 

Oh and timing was advaced to 14*. seems to have considerably more snot. One weird thing though. If I accelerate gradually (but quickly) everything runs fine. But if i floor it the car bucks like crazy. this only happens @ full down pedal. if i'm a centimeter off the floor, its fine. New injectors perhaps?

 

doubtful. i'd look into possible TPS problems.

Do you have any stuttering issues while taking a hard, right hand turn?