Will not stay running.
93 buick PA. 3800 NA.
This morning, when i started the car, I noticed the idle dropped momentairly, then came right back up, and the car was working normally. The second i pulled out of the driveway and released the throttle, the engine died. Its been doing it all morning, had a hard time getting the car to the shop, had to just keep the throttle open enough to keep it from dying. The car runs good, smooth power, shifts in all gears.
Checked the IAC, the spring and (pintle?) fell out when i turned the key on, so i tried another IAC, and still no luck. The EGR is working good, no leaks in either 3 of the pintle holes.. Fuel pressure is 48 and drops to 40-45 running. It also holds pressure really well, so i've ruled that out.
I have the use of a Genesis scantool, and i am going to do a little poking arounds there, but what should I watch for? I do have engine cranking signal as the scantool shows rpms while cranking, and i get spark to each cylinder..
I've done the fuel filter, plugs, wires, cleaned the TB a year ago so i'm running out of ideas here. I'm gonna go home and grab another IAC and see if that fixes it, but other than that, i'm outta luck here..
2009 Pontiac Vibe AWD 2.4
1993 Buick Park Avenue 3800
1984 Chevrolet Citation 2.5 liter four.