???Help??? dont know where to start

Ok Im lost now.. the I replaced the alternator today and I was driving along and the car just lost power, then it had a rush of power and just shot off like i was flooring it. then lost power again... Its up and down either has no power or is pinning you to the seat.. Please help i do not know what its doing

Have you checked the throttle position sensor?

AF is a good start!

Lost Power as in 12vdc, or performance in engine?

Lost Power as in 12vdc, or performance in engine?Indeed. No clue what the problem is, so providing a solution will be hard.