I have a P28 ecu i got from a friend it has been chipped he had it in a 00 civic si with a jumper harness. He also had a VFAC and i think that went bad and then the car started running like crap hard to start cel anyway i put it in my car which is a obd1 92 civic hatch with a swap and the chip is for a b-series but the car is hard to start and when it starts it throws a Code 4 which is crank angle sensor well i replaced that and it still doing the same thing. I put in another stock p28 ecu and it runs normal with no cel lights and not hard to start. I was just thought i would see if anyone might know what is wrong with it? I sent to a place that repairs ecus twice but he said he did not know what it was. Plus he did not have the right stuff to test it So if anyone has any idea what it might be please help me out thanks.