Have a 98 Montana with 100K, oiginally it was throwing a P0300 code and had 10 psi fuel pressure, replaced: fuel pump, fuel pump harness, tps, iac, plugs, wires, coils, rebuilt injectors, and CPS. Car starts and runs smooth now but wont idle, it just dies. I disconnected the wire harness from alternator and it runs fines till battery dies down, so I replaced alternator and no change, with wire harness connected, car wont idle. It starts and is smooth but after a couple seconds dies. I will mention the CPS appeared burnt when I pulled it. There are no codes or pending codes, longterm and short term fuel trims are staying at 0 and not adjusting. I also replaced ecm (had it calibrated by the vin number) and its the same with either ecm installed. Any thoughts on what would cause it to die with harness to alternator connected? Or ideas on how to dx this farther?
any input would help
Monday, January 9th, 2012 AT 4:15 AM