My 02 MC ss is driving me crazy!! Engine starts but won't run, changed iac, cool temp sensor, crankshaft posistion sensor, and maf sensor, nothing has helped. Took it to Chevy for full diagnostic and Said nothing was wrong. Drove down the road and stalled at 45 mph. Have another shop looking at it and they can't figure it out either. When I changed cps it ran fine for a week and started stalling and won't idle. It only has 82,000 miles on it. All codes are showing is idle control system.

 

What about your alternator? I've had that problem in a dodge pick up one time and it died going down the road.