So today I installed a new IAC pigtail from the engine to the computer... Went through the TBI setup and with the IAC forced close and then unplugged the truck idles at 525. Plug it back in and after a few minutes back to 1000 it goes, with counts in the 50's. is there a sensor you think could be causing this? I data logged today but I'm not sure how to post it on this thread. Thanks for everyone's help, Jason