Car has been sitting for maybe 2-3 months. Put the engine back in got everything ready and now i cannot get the tuner to communicate with the pcm. The car WILL turn over fine, but it will not turn my fuel pumps, fan etc. on. It wont take a tune at all, as soon as i try to load it it just gives me a error. I dont know what possibly could have happened in the 2ish months because the battery has been unhooked, and i believe the problem is between the key and the PCM, or the PCM itself. The tune that was on the car has PATS disabled because i had issues in the past but this is different because when turning the key on, no signal is telling the pumps to come on, or anything else for that matter. Ive checked the fuses (no relays) and also went over all my grounds on the car to make sure they were hooked up and tight and everything is good... Im lost and before i go buying another computer maybe someone can help???