My 1997 Silverado 1500 FWD idles too fast. It seems to jump up to about 1200 and then will slow settle down to about 800-900. If I slow and go through a stop, I take off like a rabbit. The truck wants to push me through the stop. If i sit for 10 seconds or so, then I can start off slowly and the idle comes down. The only computer code I am getting is "a rich/lean situation in cylinder 8".
I have had it in and the best guess anyone can give is I have a intake manifold gasket leak, but they don't sound positive about that.
Looking to see if this could be the case before I commit to such and extensive repair.
Any help?
1997 5.7 vortec idles too fast
5.7 Vortec idles too fast
Yes, intake manifold gaskets leaking vacuum can give the problems you are having. Spraying a little carb cleaner around the base of the manifold would show a vacuum leak by changing the idle when you spray. Any other source of a vacuum leak will also do this.
Make sure the throttle is not full of carbon as this can contribute to idle problems.
Make sure the throttle is not full of carbon as this can contribute to idle problems.
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