ok guys, a few months ago my cars plugs kept fouling out and my car started missing. So I spent damn near $400 having the best plugs and wires that money can buy put into it. and it ran badass for a while, but now its doing it again. any suggestions?

 

What car? What engine? What induction?

 

its a 1986 trans am 350 tpi

 

Take off the coil wire to the distributor and stick a spark plug in it. Do this at night. See what kind of flame you get. You are looking for a blue flame. It being an 86, I am not too sure that it is sealing well. Also do a compression test. You are looking at getting around 150 psi. If you do this, it is very important that the values are within 10% of each other.

By the way, when was the last time you changed your O2 sensor?

 

What kinds of plugs are you using? If your using anything bosch then that is your problem, I tried to run bosch 2 and 4's in my car ran like crap, went and bought Ac Delco spark plugs ran like a champ, I would say either use Ac Delco's or if your running nitrous or Supercharged, get some NGK's of semething, but I would do all of this after the compression check. Have you ever replaced your valve seals?

------------------
86 Chevrolet Camaro Iroc Z-28 Fully Loaded With T-Tops
Mods;
Spohn SubFrame Connectors, S&W Race Car Chassis 8 point Roll Cage, 1997 SS Aniversary 3.42 POSI Rear End with 11.75" Rotors and Dual Piston PBR Calipers, Balanced Drive shaft... Others soon to come...

Best times before any mods done, Complety Stock;15.6 @ 87mph
Waiting for New Motor to be built to see what I got going on Now!

ntimad8.cz28.com