Question about 1998 Chevrolet S-10 Pickup

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My 1998 s-10 is idling high and low, keeps switching back and forth when in neutral, also it sounds like a pump or something is running sometimes from underneath the truck.. just recently had my tranny rebuilt. automatic. 4spd. engine light goes on and off about my egr valve sticking. related?

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  • Chevrolet Master
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If you have an egr code, check that and clean/replace as needed. be sure passages to and from it are clear and that any electrical and vacuum connections are good. Likely that will solve the "searching" problem, but if not, next item to check would be your mass air flow sensor.

Posted on Oct 09, 2009

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I have a 1989 ford e150 5.0L. have to hold pedal to floor for it to start and it runs ruff and coughs when its running sometimes stalls when driving but will run great at times. oh and idles high and low...


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Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
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TRY THIS BEFORE U SPEND ANYMORE MONEY N PARTS.
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