02 grand cherekee 30,000 on crate 6L4.0 upon starting high idle 2000rpm. Will stall when idling or driving at any speed. Wont startfor hours after stalling. Replaced air idler control valve and throttle position sensor and now it doesnt start?

What is your question?

High and rough idling upon starting Stall when idling and driving at any speed Will not shift into overdrive Replaced air idler control valve and throttle position sensor and now it won't start. Not even firing. 30,000 on crate engine My first Jeep. And possibly my last.

What makes this problem better or worse?

Nothing

How long has your 2002 Jeep Grand Cherokee had this problem?

Last month it has gotten worse.