99gt302

Well my car started missing again. 99 GT, 4:10s, XPipe w/ no cats, flow masters, mac cai.

I replaced coils with some used ones(all tested good on OHM test) I think its got a bad one again, when its humid out it does it most. Before I start checking coils, is there anything else it could be? IM not throwing a code for misfire. I know u can check the COPS with an ohm meter(all read 5.7X and up) can I ceck any other part of the ignition to see what it could be? Seems to do it mostly in lower RPMS/High Gear. I replaced the fuel filter also.

Also, I have been running ngk tr6s since I use nitrous but I believe they may be too cold. I blow a lot of black smoke and run pretty rich. Would a hotter plug help burn off the fuel more?

cliffyk

"Blowing black smoke" and running "pretty rich" will cause misfires. Also, how many miles on the plugs?

The NGK TR6 is just a plain ol' cheap conventional electrode plug, if they've got over 15k on them I'd replace 'em just for good measure. A hotter plug would help too if you can't fix the overrich condition...

99 GT vert

i have the same problem and i cannot figure it out either i have tried changing the coils but no luck yet