Lexus A.F.M. Yes/no
 

I installed a Lexus a.f.m./ 550 injectors and no others mods yet? it has wiered miss fire at idle it like it has either a short in the coil pack or it runs like it has stuck valve but this a brand new engine it dosn't it all the time, it seems like it dose in warmer weather then I when to the supra a.f.m. it runs better(overall) seemily Don't know what to do,Lexus Yes/no?? to lean?? any one know?? or supra a.f.m...."yes/no?? to rich/ to lean I plan to do other mods later (bigger turbo and boost controll and exhaust

The Lexus afm (electronics from mk3 and LS400 are identicle) is bigger, so the computer tries to compensate the larger amount of air with a larger dose of fuel...causing a bogging or "misfiring" effect.

Its really just the motor is running so rich at idle. You might have fouled out some plugs though. I would check them before anything. I went through 3 sets of plugs in 1000 miles after my rebuild. tuning the car/getting it running right in time.

-Jonathan