1989 5.7L surging idle

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03-05-2009, 09:31 PM

caddy500

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1989 5.7L surging idle

I have a 1989 suburban with the 5.7L with a rolling idle concern. I've replaced the intake gaskets, TPS, IAC, EGR valve, with no luck, sprayed carb clean all over with no change. no check engine light. no codes.

03-06-2009, 06:49 AM

swartlkk

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Try clamping off on the PCV hose and the brake booster hose and see if that impacts your idle.

03-06-2009, 09:28 PM

caddy500

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I will check it tomarrow thanks

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