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I have a 99 galant which has an rpm needle problem. on 1999 Mitsubishi Galant

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I just had my timing belt and crankshaft sensor replaced. Car runs fine but once i turn on the heater the cars rpm/idle needle starts moving uncontrollably and the car start to misfire by shaking and not wanting to accellerate. The check engine light also goes on but i had the light check and it says it needs a tuneup which i already did with new parts. I dont know what to do.
(2) Answers
(3) Comments
you need to resolve the light issue which is telling you about a missfire. start with a compression test to see if there is any valve damage.

Roy
the check engine light appears once the rpm/idling gauge starts to spin uncontrollably. Once that occurs the car begins to lose power, shake and not want to acccellerate. I also change both coils.
I want to make sure I understand.....the engine misfires only when you turn on the heater?......or the misfire becomes worst when you turn on the heat?
A diagnostic is needed to resolve the problem........has anyone replaced the radio or installed alarm, made any changes electronically?