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Re: Rough Idle and overheating
What does the exhaust sound like? Does it pop when the car is idleing. If so you may have an engine misfire or a burnt exhaust valve. The only way to see if the valve is burnt is to do a compression test. If you have a misfire you should have a misfire code in the computer. Scan it to see if there is a code and this should help you find the problem. If there is no code then do a compression check to see if you have a burnt valve.
If the valve is the problem the cost will be high due to having to tear the head off and either replace it or repair it. Quite time consuming.
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