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AutoMD ... 5/4/2014

1990 Chevrolet V1500 Suburban Silverado 8 Cyl 5.70L

Engine

why does car run rough at start up only when engine is warm?

rebuilt motor has 30000 mi. must keep rpm high when its running rough or it dies. recent egr valve replacement. only runs rough for a few minutes and only if it has been sitting for an hour or two. check engine lite does not come on.

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