Have a '86 300zx turbo with 52k miles, runs very strong but misses @ idle after warming (no miss when cold) any ideas? Mech @ local dealer says carbon build up ...
Gain a little info by telling us what the plugs looked like when you pulled them. have you gapped them properlly? what fuel are you running? Is your head gasket blown? Whats your timing set too? Are your injectors clean? The idle control valve, turn it all the way down so that it doesnt interfere and make the car idle more lower, then operate the throttle screw to set an idle, does it idle and miss then?
Is the miss every firing cycle? is it after a couple revolutions?
Taking care of these and testing them, will show you why its missing.