Hi there, can you tell me the engine size. it sounds like you have a problem with the idle speed adjuster. you can try and remove it for cleaning. they tend to carbon up inside and stick, which causes the idle problems. however if your car is a diesel then this fix does not apply. cheers. dave
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change your thermostat, and your temperature sensor. The sensors can have a tiny crack in them and cause a lot of problems. Once this is done you should notice a difference. Special note, check to ake sure your fan is coming on, and that your water pump is good. Remember if you change your water pump, you must change your timing belt. If you don't you will be replacing them both in under 6 months. Also make sure your coolant is still good.
Try changing your idle control valve or stepper motor which is the same thing.try cleaning it first before buying a new one,this could be done with caburetter cleaner, let dry before replacing,hope this is helping ty.