[Ridenour]

Yeh, those accessories put a drain on the electrical system = weaker spark = lower rpms. The biggest drain possible is by the rear defroster. I don't remember the specs, but turning on the rear defroster puts a hugeass drain on the electrical system, so make sure you don't have it on with too many other assecories, as it could actually stall you out if you already had idle problems - also make sure you don't have it on if you're in a situation where you need power.