92 turbo messing up?

I bought this car about 2 months ago. Took it to Toyota, they said I needed a whole new turbo bla bla bla tryed charging me 6000 dollars for the whole deal. So I take my turbo to get it rebuilt. It gets rebuilt, we put it back in.

The check engine light has always been on at start up, but it goes away after about 5 minutes of driving. The second light that has now popped up is the check engine coolant light, but I have plenty of coolant in it.

Now for the problem. If you get on it, it'll stop accelerating and just chug chug until you push in the clutch, or change gears. Then when you change gears it'll do the same thing, or just throw you forward as if you downshifted.

Second problem with it, if you get on it and push in on the clutch or put it in neutral it dies if held in too long.

Okay, it stopped messing up alot for about a week. It still chugged on occasion and would die maybe once a day. Then I had a really quick take off in first and now it dies literally every time it is in neutral or the clutch is held in for more than 3 seconds. It still chugs also when you get on it sometimes.

please someone help