Have a TCM FCG25-31 that hunts at idle after 1/2 hr. run time. Had exhaust pipe and muffler replaced, and new LPG vaporizer installed. Runs good when first turned on, but hunts at idle when hot. Coolant level in rad is right up. S/N is A47F00393. I suspect the MAP sensor but don't know how to confirm. Any help would be appreciated.
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