On GM cars, it can be numerous issue, im surprised he not pulling any code, did you take it the dealer or one of the small garage mechanic. they are two different breed and may have the right equipment or updated computer. have you air mass/throttle sensor check common problems at idle the engine stall. you cant fix the unit, it has to be replace if it bad, check ebay for used if needing to replace the unit
Testimonial: "thk you very much. it was a small mechanic shop who'd installed the engine before i bought the car. ill run your reply past him & see if thats it."
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