hey whats a good compression number for a 300tt engine? its a 1992 and i wanna do a compression test to make sure the engine is good..car smokes so much and runs like crap..its dumping so much fuel...i was told from the previous owner the car has a stage 4 z1 motorsport ecu..i wanna put back a stock ecu in this car...dont see the reason he put a stage 4 ecu if the car has no extensive mods?