High idle in park and neutral

Hello, we are having issues with our car that are high idle park and neutral. The engine is overheating to high idle.

We had a mechanic come over and we replaced the following:

Throttle body (167.00)
Map sensor/master air flow
TPS three times ( showing incorrect voltage on scanner tool)
EGR valve
O-rings on fuel injectors
One fuel injector
Manifold gasket
Spark plugs
Spark plug wiring


There are no engine codes.
One time it shown multiple misfiring code we cleared it out and it went down and we turned off it idle high again in park. We checked for vacuum leaks (mechanic did) and there was none.

Please help we are are our wits end here!