Hello Scotty.
The engine of my Toyota Corolla 1995, hesitates when I accelerate, it lacks power. I have checked the fuel pressure, it is within normal (38 psi). Clean the injectors but the problem persists.
In turn you can hear a noise in the muffler, like small explosions.

it's backfiring, on those, try a new distributor cap, rotor, spark plugs and wires to the plugs