Hopfully i am posting this correctly. I did all the google searches i could think of and also serched this site and found nothing. Maybe i am just using the wrong words in my serch. Anyway, i have a 2000 k3500 with a 454. (I just got it and its the reason i joind this site) the problem (of many) i am trying to figure out is when i connect my obd2 scanner (innova 5610) and look at the live data the rpm's are way off. It reads over 3,000 rpm at idle. The tachometer is reading correctly and the obd2 reading does respond when i speed up the engine but it is constantly like 2,500 rpm higher than what the engine really is. I am worried that the incorrect rpm reading is being fed to the other systems and that might be causing some of my other problems (transmission, etc.) Or is it just a glitch with the live data feature / obd2 reader. Any thoughts or suggestions would be appreciated. Thank you!