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Idle problem is fixed ! I found alternator wire and battery wire are rotten so I replaced them with new bigger wires same as ground wires . The stop screw surface at throttle body is worn out little caused idle drop so i readjused to 700rpm when engine fully warmed up , now it idle 700rpm when...

I just cleared the code and press a/c button , the code does not come back on , A/C compressor still have no signal so it doesn't turn on yet and idle problem still the same .

Thank you for quick response , so should i use .015 - .02 shim or .0015 -.002 shim clearance between lever and stop screw before i check IDL and E2 for ohm . My AC is not working so i bypass it for now .

My car is 89 7mgte recently acting weird . Cold start at 1000rpm 13.4 volt after 20 seconds it start drop to 500rpm 11.5 volt then 400rpm 11.4volt then it died , i replaced it with fresh battery and alternator . There is no check engine on but when i do diagnostic it found code 51 any help...

Hot ride ! welcome to SM .