Car is 95 5.0 - 306 crate The tachometer started bouncing today...There is NO performance change although the tach is bouncing. Very Strange. The rmp gauge will bounce at idle and while I am driving. But the actual sound of the engine does NOT change at all when it bounces. Car sounds perfectly fine which is leading me to believe this is electrical. Any idea's? There are NO exhaust leaks on the car just would like to clear that up. The ignition system....the entire ignition system is about 7months old including the distributor. The MAF was cleaned about 6 months ago during regular maintenance. I'd just like to reiterate the car is NOT stumbling when the tach bounces...there is NO sound change what-so-ever so I'm baffled on this one.