So my car had a high idle issue for a while so I replaced the IAC with a new one. No codes. But when I turn on the car the same thing happens. When I lightly tap the throttle it jumps up to 1500 to 2000 for a couple secs then goes back down. The real issue is I start in first and it jumps up to 2k (I usually shift at 2k) Then When I shift to 2nd from 2k it jumps to 3500. At this point I think I need to shift again so I go to 3rd and it jumps to 4300.