Well, I'll assume that you are misfiring while driving sometimes and you are trying to troubleshoot it...

Here is a list of stuff I would check:

Pull any codes from the ECU.
Coil pack connections (the inserts on the wires that plug into the coil pack)
Check the gap on the plugs (I've heard of some of the iridiums being way off and um... you can't regap those)
Check your airfilter, make sure you're not chocking the car.

That's the easy stuff I can think of.

 

mabey go a step colder on the plugs.

 

The only reason im revving while parked is because if I drive it on the road to 6000 rpms it doesnt misfire as often. I should have mentioned this before. In nuetral, it misfires more often.

I will try those things 1st,

-check codes
-regap plugs
-check connectors
air filter is almost new.

Hopefully this fixes it.

 

also check your cat, if you still have one. It could also be chocking the car

 

Yeah the the cats are gone. Im gonna check all those things this weekend, hopefully it gets fixed. Ill post results next week.

Thanks for the tips.

 

What boost are you running?

 

running 15 psi, still havent had a chance to check.
probably wont be for another week. theres never any time to work on the supra. I may have to take a pto day off from work

 

For 15 PSI, you should probably go at least 1 heat range cooler than stock, and you'll just have to gap them to find what's good for that plug. The plugs I use are 2 heat ranges colder and I use .035, and I've boosted a little over 18 PSI with no problems, all the way to redline (also BPU). Try some of the recommended plugs on MKIV.com.

 

wow my plugs are cooler than stock and i have them gapped to .028 and running 14 psi

 

i have autolite 3923's, gapped to 0.028". have run 18psi on them with an upgraded turbo etc.. no issues. this was on a 7m though. whats the afr's?