[justpassntime]

It is so much easier if your car has a atmospheric or barometric pressure sensor.

This sensor, depending on what your particular manufacturer calls it, controls the fuel mixture by sensing the ambient pressure at what ever altitude you are driving. The higher the altitude the leaner the fuel mixture.

All you do is put a 25k potentiometer switch on it and turn it down till the idle speed changes. All you are doing is telling the ECU you are driving at a higher altitude than you really are. There are no problems with warning lights or ecu problems this way.

Just be cautious you don't do to far or you can burn pistons or valves due to higher cylinder temperatures.