Just a thought, but maybe we just need to reset the TPS and drive the truck more. I just replaced my ISC this past weekend after mine crapped out. Had a high idle problem after I changed it (1800rpm). Took a full 2 days for the computer to adjust, and now the truck idles fine. After that I had to adjust my TPS, because after reading the FSM again, I've been doing it slightly wrong, but close enough for it to work. Then the truck threw codes for the MAF, but that's my fault. Air filter was severely clogged, and the MAF was dirty. New filter, and some MAF cleaner cleared the codes after driving about 40 minutes. Food for thought.