Here’s a list of some of the other things that need to be checked before replacing any more parts. The throttle body for a clogged port or improper adjustment. The intake manifold gasket for leakage. The intake air hose for being loose and leaking. Vacuum leaks in general. Incorrect engine coolant temperature sensor output. On some models incorrect throttle position sensor output. Then you get down to the wiring from the computer to the idle air control valve or the computer.an Speed sensor