2000 GMC C2500 V8 Two Wheel Drive Automatic 135000 miles
code p0507 " rpm's too high" tested the idle circuit for resistance and was well within the guidlines. (55 ohms) sometimes the idle will drop to 500 rpms while in gear but in park. Sometimes 700 and sometimes 900-1100. No other codes come up so is my pcm going bad. Also. Used to start right up but lately. It cranks a little before firing up. I'm so frusterated that i'm ready to put a match to the truck
Try cleaning the throttle body first, this will cause an idle surge and RPM flucuation. Post back with what you find.
February, 4, 2010 AT 12:51 PM
February, 5, 2010 AT 9:23 AM
Cleaned the t.B. Seems to be running better but I only went around the block, i'll be driving from northern ca. To southern ca. This week end. Lets see what happens then. Thank you so very much for the quick response