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I am having this weird idling issue where when your first start the engine cold, it idles high like it should, but after a minute it starts idling really low (400-500 RPM) and then stalls out. The funny part is, even when warm it will dip down to 500-600 RPM, but it won't stall out as often. I have tried the following:
1. Boost/Vacuum Leak test. I have a very very very small boost leak which shouldn't be causing this problem.
2. Cleaning throttle bodies.
3. Adjusting the Idle Air Screw - turning this screw does absolutely nothing to improving the idle. I have it backed out almost all the way and the idle doesn't rise. However, if I full screw it in, the car will stall right away.
4. AAC Valve does appear to work. I can hear the solenoid ticking away. I have also done the WD40 trick to clean it and lube it.
5. Used another ECU. It didn't make a difference. So, what would be causing the issue. I plan on trying another set of MAFs, but after that, I am stumped. Thanks in advance.
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