[explicitone]

I (with the help of a friend) installed my mac prochamber on sat. and since it went on, the car idles funny but only with the heat on. the idle will be fine then all of a sudden it will go up to 1000 then down to 500 then be fine again for awhile some of the times it dropped so low it almost died. what could this be? I dont see how the prochamber would cause a idle problem.