Originally Posted by mscaggs
Agreed, however, there is no short and wiring issues as I have already went through that very carefully. When I disconnected the tach from the dizzy issues gone. Like I said before, when I would touch the brakes causing a change in vacuum it would clear for a moment. This is a weird one for sure...
If you disconnect the tach wire and the problem goes away it is not a vacuum issue, it is a tach wire issue. The fact that stepping on the brake fixes it would show that the movement of the pedal is doing something with the wire.