1993 Chevy Blazer

1993 CHEVROLET BLAZER
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CM4202002
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Engine Performance problem
1993 Chevy Blazer 6 cyl Two Wheel Drive Automatic

My s10 blazer is surging. Check engine codes TPS, knock sensor,and speed sensor. I replaced TPS and it got better. Light still on. I know one code can trigger another. So I replced pcv valve and it even better and the light went off. It is still surging, but not as bad and the gas mileage went up. Could the egr valve be bad?
Mar 14, 2010 at 5:43 PM
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