Ok i know i have a MAF problem(wasnt too sure before) got hold of a known good one and my car is still acting the same wont rev past 1500 rpm, engine very rough idle and it shakes very violently, like the firing order is off it has to be in the injectors case i know its not in the plugs, does anyone know how to check the ground for the injectors? BTW i put my MAF on another supra and the car wont rev past 2000 rpm just to test it and make sure im going in the right direction.