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Q:

why does my engine load up after getting fuel on 2004 Chevrolet Express 2500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
also does the same thing when backing in a steep drive way it happens intermittentley i can clear it out by revving the engine
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Most likely the fuel pump pump is going bad. Will need to check pressure and volume. They go bad right around 100k.
I found that to be the EVAP Purge Control Solenoid located at the throttle body. Everytime i filled up with gas van didn't want to start. This fixed it.