Not Sure Whats Wrong...please Help Lol

I have a 94 gt 5.0. ) last week I was on the highway and it just stopped accelerating. So I pulled over and it died. Got it towed to a shop cause we werent sure what it was (had fuel and spark). They said it was the maf sensor...so whatever they fixed it and ran good....but yesterday it did it again, but this time I got it started and got it home fine....any ideas whats causing it? Seems like its mainly doing it at higher speeds....but maybe its coincidence. No clue. Just dont know where to start. Any suggestions?

They ran a test on it and I guess a code came up pinpointing to the maf. But, im actually at the mechanics right now getting my fuel filter changed....and when he was changing it something deteoriorated....not sure what it was. So thats gotta be it? Lmao hell if I know anymore lol

But from what I know if the proper amount of fuel isnt going thru itll stall, especially at higher speeds. So im trying one thing at a time lol