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1998 chevy silverado 5.7 vortec
Problem is engine revs high when punching on gas at 60mph to pass someone on highway and truck does not accelerate just the engine revs at a higher rpm. Any Ideas??
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Check and make sure the distributer is advancing the timing. If you have a timing light mark the balancer with chalk or a paint stick. When you rev the engine the mark should move. If not you have a bad distributer.
Most likely the intake gaskets are bad. they will sag in the middle over time and allow a vacuum leak between the head and intake. recommend replacing the gaskets with the steel instead of plastic ones.
Go to your local shucks or auto zone and they can check any codes behind your check engine light and it's free. It sounds like one of two things a O2 sensor or your mass airflow sensor but they will tell you for sure
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