1989 S10 v6 4.3 manual
I had my dude drive my S10 first mistake and he rear ended someone and the truck started shuttering and not accelerating right. Really jumpy and if forced would barely stay on. We replaced the idle air intake censore and it worked great for a bit but now it has started to do it again. It'll drive for a bit then of we stop or down shift it looses power and accelerates all jumpy even when your foot is all the way down on the gas.
it doesn't have any visible damaged from the hit so I feel like it has to be a little computer somewhere or a clogged/pinched fuel line. I replaced fuel filter and gave it a fuel treatment. I don't where to start from here.

 

Now I've replaced the distributor cap and rotor and was working better but still has the loss of power 3rd gear, any ideas