There are many things that can do this. I would start with getting the codes read from the computer, Even if there is no light. The first thing I suspect is the catalitic converter is clogged up. Let me know Randy

Fuel pump pressure at the carburetor or injectors is probably too low. Check/replace the fuel filter to eliminate the possibility of a clogged fuel filter being the culprit. After you do that and still no improvement, check the fuel pump pressure. Still too low? Probably need a new fuel pump.