1996 c1500 Chevy Suburban 5.7L developed a hesitation/stumble with light gas pedal pressure shortly after startup. No problems starting engine, no problems at higher rpm. Did it in warm weather or cold weather and would run better once warmed up (less noticeable). NO trouble codes though to tell me it was the EGR valve failing - just some research through troubleshooting manuals. $150 bucks to fix, and improvement in acceleration was immediate.

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