Fuel pumps don't have a predictable life... they can last 300,000+ miles or fail with only a few miles on them. First thing to do is check to see if the "Check Engine" light is on. If it is, then you have some codes in there and you'll want to retrieve them. They may give you some hint as to what is going on. If you suspect the fuel pump is the culprit ..you can get an inexpensive fuel pressure tester at your local NAPA store. You should also look for vacuum leaks and check the timing. Another common problem with early 90's GM cars is the MAP sensor and the MAF sensor. Both could cause the problem you are having. Other possible causes are a clogged catalytic converter, a bad torque converter lock up solenoid, a faulty distributor pick-up coil or control module, or an EGR valve which is stuck in the open position. Good luck with it.