2004 WRX STI – This car is brand new to me, the mod that I can see is an aftermarket intercooler in front of the radiator. It idled fine, and did not run properly under acceleration. It had a code for a faulty tumble generator sensor and/or motor. I replaced the tumble generator motor with one from the dealer. I also replaced the tumble generator position sensor with one from a used manifold on what I think is a different model car, it may not be an STI (the donor manifold had smaller fuel injectors). Now the engine turns over, but it won’t start. While the key is in the run position: the radiator fan; fuel pump, and several relays all cycle on/off, on/off, etc. The check engine light blinks and several other lights on the dash are on. It still has a code for an O2 sensor and some undefined codes.