check your vaccum hoses for leaks and flush/bleed your coolant and radiator, replace thermostat, clean/replace fitv under throttle body with a known good one, mayb try replacing the iacv with a good one too.
It was none of these it was the intake gasket and to find out if that's your problem get some carb cleaner and spray it around the intake gasket while the car is running. If the idel changes and makes a diffrence you need to replace the intake gasket.
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