Trouble maintaining idle in hot weather

[Chuck Norris]

It's been in the 90's here and I ran the a/c which works fine. I shut my stock '95 explorer off and when I went to restart it a few mins later it would turn over but then die shortly after. This continues untill I turn off the a/c. It then will stay running but at around 2-300 rpm... I usually have to keep one foot giving it enough gas to get it up to a normal idle speed and use the other foot to brake. It will eventually work itself out to where it will be up to a normal idle speed on its own. Any help would be appreciated. I've probed the IAC with a voltmeter and it's fine according to the manual's volt spec's and I also cleaned it out w/ some carb cleaner, and I tested the TPS which is working correctly and fluctuates the resistance according to the throttle position.

 

[my98nnj]

Clean the MAF, if the issue still exists, replace the IAC valve.

 

[Chuck Norris]

The MAF connector and sensor both appear to be fine (tested it with voltmeter). I also checked the IAT and it showed the correct resistance and I tested the EGR system as well. All function correctly (or seem to at least). This problem only occurs when the weather gets around the 90's... it's not a consistant issue. I'm going to test the engine coolant temp sensor tomorrow when I have some more time.

 

[chance942]

Fuel psi when it's doin the crappy rpm thing