92 S10 blazer stalling problem
 

So I have a 92 s10 blazer 4.3l & for the past month or so my truck has randomly stalled on me. Last night it did it again & I can't figure out why it's doing it. And when I started it up today it ran but it didn't sound normal but I put it in drive anyway & when I did that I let up off the break & without pushing on the gas the truck was wanting taking off on its own & I mean it wanted to move. So I just pushed the break back down since I never really took it off of it & it just jolted to a stop. I have no clue what is wrong with it & ive read a few things but I can't seem to really narrow it down to what the problem is. I can't really afford to replace a bunch of parts to try to find out what it is.