88 blazer 2.8L 220 injector unit 40,000 miles. it idles at1200 rpm on dashboard tach. in drive it goe's down a little bit. put new air cleaner gasket on. hasn't been tuned up in maybe 2 years.

Look down inside the throttle body to see if you can see any gasket material that has been sucked inside the throttle body. If the gasket os torn, the rpm's will increase due to excessive air and the ECM will add more fuel to compensate for the extra air.


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Being way2old is why I need help from younger minds

i checked that didn't see any gasket in the way. i'm going to try some iac valves that i can get from ajunk yard . for now i'll be closing this post. thank's for your answer.

Using junkyard parts can cause you even more headaches than you have now.

If your going to take the path of throwing parts at it, then change the whole throttle body including the IAC. You may have a better chance.




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(This post was edited by Hammer Time on Oct 10, 2009, 9:41 AM)