My LaSabre will not go over 25 when I press the gas on 1990 Buick LeSabre

I have a 1990 Buick lesabre when I press the gas it acts as if it doesnt want to go it only goes maybe 25...what may be wrong with it..

Asked by for the 1990 Buick LeSabre
Sure sounds like could be clogged exhaust at the cat conv. Have a tech check for back pressure problems. If is ok then check fuel pressure and volume.