1989 Chevy Beretta possible ecm problem

1989 CHEVROLET BERETTA
12,000 MILES • 6 CYL • FWD • AUTOMATIC
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JHENRY
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i have a 1989 chevy beretta 2.8 gtu automatic and it will run and idle like a dream for about 30 mins then the idle will accelerate and sometimes stall, but it will not throw a check engine light and when hooked up to a computer all systems diagnose working properly. please help
Oct 18, 2009 at 1:37 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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