ok since i gotten the car up and running i have no problems at all..butt after ahile my rear bumper is coated with black sute, and melteing,
also it back fires on idle butt i think thats b/c i have shitty plugs in it and havent changed them since i got it running, also i replaced cap rotor and wires ext and have no vacume leaks, runs fine all day with no problems

i like to fix this issue and have a clean rear end.
its a single cam if ur all r wondering AND i have no ecu codes at all..

can it be my o2sensor?
any ideas

also on a side note i would like to convert to power windows, ill be getting the doors and wireing to it. is it a simple plug and play or am i gona have to run wires?
buddy of mine is partying out his 240 and i got first dibe..