89 chevy problems

Asked by Jan 30, 2015 at 01:10 PM about the 1999 Chevrolet Silverado 1500 LS Standard Cab LB

Question type: Maintenance & Repair

when the truck is cold it runs excellent but when it warms up it dies out and I lose all horsepower I can only get it to go 20mph I did a full tune up, changed cathletic converter, feul pump, fuel filter. and the throttle body sprays good. I need help with this problem. and I also changes map sensor

1 Answer

Mass airflow sensor, mine had the same problem.

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