I have a 1999 GMC Sierra 1500 it will start and stay running but as soon as I hit the gas pedal it dies. there's no check engine light and it hasn't thrown any codes
Test the fuel presure. If it's low change the filter and re-test. If it's still low check the regulator if thats good it will be a weak pump. How many miles. 220k is about their average life.
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