1993 Chevy Blazer RPM guage jumping, stalling and now will n

I was driving my blazer the other day and ran just fine but then it started to make noises and the rpm guages was jumping from 2000-5000 2000 being what it normaly is at when driving and 5 being the red zone. And the rpm would drop to zero and id rev my engine and it would catch and make a noise and start to move and it kept doing that till it just stoped and stalled the electronics never went off but I could not get it to start, it would crank but nothing more.
iv replace the fuel filter and the pump works fine and iv got no idea what to do now
also when I am able to get it to start and idel it will idel for about 2 min the die