I did a search but nothing fit...

I thought it was intermittent problem, but finally isolated the stall to having a load.

When driving around, engine is fine. If I come to a 'straight' stop...no problem..idle is fine (800 rpm).

When in a parking lot at low speeds, truck will stall if I don't give it gas. Same if I have to 'turn' to get out of a space. At normal/low idle, engine will immediately stall if I turn on the the AC.

I checked for vacuum leaks, but didn't find anything. Reading up on the IAC I get the impression I would have a constant idle problem.

If it's a vacuum leak, where should I concentrate my search?

 

Probably not a vacuum leak if you already checked it. You have a few parts that raise your RPMs when turning and when the AC is on. Check the power steering switch on the PS pump and trace the vacuum lines from there.

 

Check your idle up hoses from ps pump. A/C also has idle up hoses. Check those and make sure the alternator is putting out right amps. This heat is a killer on batts and alternator. Start with idle up hoses. Good luck buddy.