This engine is plagued with egr issues! the 4.3 liter engine is suspect to carbon build upo inside the intake, the chunks of carbon break off and plug up egr so the pintle can not close fully...the good news is the valve is not bad.... remove the valve, carefully clean the pintle free of debris. start the vehicle with egr valve out..make sure wiring for valve is out of the way....it will be very loud..rev it up and down a few times to help purge carbon chunks out of the intake. reinstall valve..this should help you..
ps your 4 thumbs up is appreciated!
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