1999 ISUZU RODEO IDLE HIGH AND LOW IN PARK ANY IDEAS TO FIX IT? i did replace IAC, TPS sensor, cleaned EGR valve, check vacuum lines, any ideas what is wrong? or how i can fix it, thanks.

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The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE DIAGNOSIS & TESTING IS COMPLETED.

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