93 BLAZER SURGING

By VICSTRANSAM
November 10, 2005 in Ask A GM Technician

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VICSTRANSAM

Posted November 10, 2005

I have a 93 Blazer with 5.7 TBI. It has a surge after warmup at 2000 and below rpm. I discovered if I unplug the EGR the surge goes away. I get no codes. What is the primary cause? O2? Coolant temp sensor for the ECM?

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