'92 GMC has fast idle, erratic shifting after warm up

[bwdearman]

ChevLoRay,

Thanks for the good advice. Well, I started my truck this morning and it was idling just fine… until I put it in reverse to back out of the driveway. As soon as I did that, the RPM's jumped up and it kept acting flaky all the way to work (54 miles). Here's where it gets weird… It ran perfectly all the way home. A couple of times, it seemed like it was about to start getting flaky again, but it stayed together the whole way. It still seems like it shifts in and out of OD too easy, but I think that's a different problem. Picked up a vacuum gauge on my way home and it read 20 at idle. Bottom line… I'm springing for a TPS first because it's still in warranty. I'm going to try and find a used scanner or someone with a scanner and give it a "just in case" scan.

I'm glad to hear that you had the presence of mind to marry a Texan. When Rick Perry (the governor of Texas) finally gets a gut full of Washington D.C. (which shouldn't be much longer) and the State of Texas secedes, I feel certain that your in-laws will take you in. I say that with certainty because… well… they are Texans and that's just what we do.