Got an idle problem with a 97 2500 powered by Cummins. The motor starts
first time, every time, no problems.
If I have the air conditioner or interior fan on when the engine is cold -
it pulls the idle down low. Sometimes idle looks like it might be as low
as 200 rpm on the tack. When it gets like this, it's easy to stall out.
If I start the engine cold with no a/c or fan - there's no problem with
idle. Any idea how to fix this?