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The temp sender for the gauge on the dash is not what the EFI computer sees for coolant temperature. The EFI coolant temp sensor is one of the two on top of the thermostat neck (the other one is a cold start timer switch). If you have an '85 I would short the check connector and drive it around like that and see if it give you any codes. The things to look out for idle switch in TPS is FUBAR (usually what gives out and causes an erractic idle), ISC valve is stuck or the stepper motor is giving out, EFI coolant temp sensor is shot. Even if the coolant sensor is out the idle should never go that high. I would put my money on the ISC valve being stuck open. By holding the AFM door shut you are basically doing the function of what the ISC valve should do (restrict or control air going around the throttle plate at idle). If it is the ISC you might get by with cleaning it up.HTH
 
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