Bucking Stumbling/Dieing Issue

[Turbo II]

Just recently went through the alternator issue. So after I got it back the 2nd time and put it back on I went for a test drive and stopped at a nearby station just to put a couple of gallons in. Left the station and not long afterwards I was cruising along and the car started bucking like crazy. If I gave it just a little gas, or let off, it cleared up. It idled fine and could go WOT with no problems. Just trying to hold a steady 45 or 55 MPH in 4th or 5th and it would buck like crazy. A couple of times it even stumbled( (?) as in it felt like the car just lost power for a second or two and then kicked back in running. No lights or anything would come on as in the car completely shutting off. Then I wondered if it was bad gas so I went to my normal station and filled it up and the problem went away. That is until tonight and it's started doing it again even with 3/4s of a tank left.

So I've spent some time tonight searching and have found similar, but not exactly the same, issues and have come up with TPS, fuel pump, injectors, grounds and a dozen other suggestions from people. To be honest most of the threads never really seemed to get answered by the OP as to what solved the problem. I'm also wondering if the alternator putting out 18v could have screwed something up. But what's throwing me off is that it cleared up and was fine for 3 weeks (not that I drive it that much) after filling it up until tonight.

So before I start tearing things apart... I thought I'd see if anyone had any thoughts.