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mis firing while driving and stutters when trying to accelerate

Car: Chevrolet, Suburban, 2001, 5.3     -    Back to Fix-It

Q.My surburan starts to miss while i am driving. It idles rough . It really misses bad when it gets hotter and if it is hot outside.Took it to a mechanic and said egr code came up. Replaced egr valve and 30 miles later code came back up. What else could be wrong ? when I am driving and i stop at a light it doesn't run bad it is when I put on gas and when running down the hiway. Gets really bad after going up hills and when bucking a strong wind.

I already checked/done: put on new egr valve

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