1989 5.7L surging idle

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Mar 5, 2009 | 09:31 PM

caddy500

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caddy500 is an unknown quantity at this point

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.

Mar 6, 2009 | 06:49 AM

swartlkk

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From: Waterloo, NY

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

Mar 6, 2009 | 09:28 PM

caddy500

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I will check it tomarrow thanks

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