Not to sure what year yours is but on the carburetors there is a screw on the front of the engine that has a vacume diafram on it. The vacume comes from a control thing with two wires on the passenger side of the carb. I think this comes from the alternator and it gives more or less vac. depending on the load of the alt. If it raises with the lights it probably does it with the heater to. Sorry I cant explain it better and I hope this helps!
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Fyfe
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