- Oct 22, 2018
Hi, I have a 1993 Mitsubishi GTO imported from Japan, its the same as the 3000gt. The car is a vr4, 5 speed manual, twin turbo. When I start the car it runs super rough and the rpms change alot. First thing I did was change the spark plugs and do a compression test. Compression is about 170-175 in all 6 cylinders. After changing the spark plugs the car ran exactly the same. Then I started checking the coils. I can unplug 2 of them while the car is running and it makes no difference in idle. So i would assume the coils are the issue but then after reading other people were saying that it could still be the ptu, ecu, an injector, etc. Does anyone know what my next step should be? The engine is a 6g72. I don't want to just start throwing parts at it, I would rather perform a couple other tests to narrow it down more. I did check the coils with a multimeter and they all read the same and are within spec.