2000 Jeep Laredo Jeep barely moves in drive

Earlier in the day I cranked my jeep up and it would not crank unless is pushed the gas pedal I figured it was due to me being just about out of gas. Jeep drove fine, put gas in drove home, later drove to another destination jeep sat for 2 hours in the cold weather, cranked just fine when I left and was accelerating just fine. I stopped at a light and when I pulled off the jeep would not accelerate unless I gave it a bunch of gas jeep slowly moved, had to stop again the jeep barely move. Pulled in the parking lot jeep will barely go in drive or reverse. Is this a fuel pump issue or transmission. I checked transmission fluid, fluid is red, full and does not smell burnt.