its the IACV, its on the intake manifold. so take our intake manifold off since you still have your stock intake manifold.
problem---------> idle is bad but after it warms up to 65 degrees it idles fine. this is your situation right now. between from 30 degrees to 60 degrees thats when you have this problem. the IACV is a little dirty or not working properly. thats why when you drive your car sputters and the RPM drops and your car is about to die.
thats what happened to mine. clean it or get a new one. it controls the air flow to your motor.
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