I have already checked the fuel pressure, and checked for leak down, it holds at 50psi for about 20mins and slightly increases a few pounds. There was no noticable difference from when problem happens and when it starts and idles properly. I am a ASE cert Master tech. The O2 sensors at idle, and in closed loop, sit at the bottom of scale until engine is reved up, but after left to idle they fall back to low limits. If I hold throttle down slightly when starting I don't have a stall problem. I have also replaced the IAC motor also, to no change. I have cleared the memory by disconecting battery for 30mins. I have sprayed carb spray around intake, vacum lines and anywhere I thought may have a small leak, but no change in idle or readings on my scan tool. It seems that after sitting for awhile, it doesn't have the proper air/fuel mix on a cold startup, or is delayed for some reason.
Monday, February 11th, 2013 AT 12:39 AM