Help 305 problem cant figre out
 

So i got a 92 RS with a 305 TBI and its been acting like a turd...one day on my way home randomly it feels like a turbo kicks in and i gain 2 more cylinders....the engine was very loud before this happened with like an airy sound....then when it happened it got alot quieter the muffler got louder and then it took off like mad.....then like later that night after driving around a bit (yes i started car multi times that day and it still was fast......it stopped and went back to a turd.....what could a possible cause be...i was going a little faster out of the turn than normal when it kicked in and i was going a little faster than norm when it dropped out o my between gear switch pts.....im so pissed i try to keep this car as best i can but i do two things and fall back 4.....is there a possibility of the WOT on the carb sticking or somethingi just dont know and how to fix it....