I have a 1989 chevy c1500 350 tbi that when in park it idles up and down and no matter if its cold or hot it has no power untill the rpms pick up then takes off. We have hooked a scanner up to it and

Asked by Mar 12, 2017 at 02:49 PM about the Chevrolet C/K 1500

Question type: Maintenance & Repair

3 Answers

31,345

and...? If it hunts for idle try cleaning/replacing filters, pvc, egr, check for vacuum leaks.

Best Answer Mark helpful

The scanner showed all sensors reading normal. we checked vacuum leaks that was good, had very good vacuum also fuel pressure is good. We just changed fuel filter. egr is good and we put a pcv valve on it roughly a year ago.

78,055

There is a idle air control sensor that would need to be pulled out and cleaned along with the throttle body, and that port the IAC Valve goes into. It is best to take the throttle body off so you can clean under neath that port. May want to replace the base gasket also, for the TBI.

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