Loses power and hesitates

Engine Performance problem
1991 Chevy S-10 Two Wheel Drive Manual 140000 miles

i have a 2.8L s10 5 speed. Has new plugs, wires and distributer cap. I recently changed the fuel filter and alternator. When idling it seeems to run fine (runs smooth n does not seem to miss at all) n seems 2 have a lot of power when revved, but when put in gear it does not seem 2 have the acceleration it should. When I make it to 60 (which sometimes takes a while) it loses power goin up hills n slows down. I usually have to drop it in 4th to speed back up then go back to 5th. Ive been told a few different things that could be wrong. What do u think? Thank you

No I havent ckecked those. How do I check fuel pressure n what will I need?

Ok. Where on the vehicle do I check the fuel pressure at?

My S-10 (5 speed extended cab 1997 is missing the wiring that runs from the alternator to the engine I need a diagram of how to rewire properly can anyone help me?

My 1989 S10 2.8 pickup loses power after a few miles of running and will completely stop running. After a few minutes it starts up and runs but with little power. The fuel pump and filter have been replaced.

The battery and alternator are also new. It begins to lose power after a few miles and eventually winds down completely. After a few minutes it will start up and run for a while and quit again if power is called for.

My truck starts up just fine and will come to a good idle after a couple minutes of warming up it can drive. But it seems like after 30 minutes of driving or so when I come to a complete stop and then I slowly release the clutch and press the gas the more I press the acceleration the more it seems like it wants to bog down and shut off. But if I take my foot off the gas it idles just fine and is even worse when sitting at a little hill I almost have to slip the clutch and slam on the gas just to get the truck to finally go and get it to where I need. Not really sure where to start looking. Could be multiple problems.