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check the fuel injectors on the throttle body as for it cutting off it sounds like there is carbon build up on your throttle body inlet valve take the hose off to the throttle body and get some throttle body cleaner and clean the inlet valve
Hello... The Sonoma has a Fuel Pump relay controled by the ECM "B" fuse and the ECM/PCM itself. The relay is in the underhood relay box. 30 will be hot all the time 85 is your key. It will become hot for 3 seconds when the key is initially turned on. It will stay alive when the key is in the run or on position B if the ECM/PCM is working correctly. If everything there is okay then its a ground problem at G102 or G402 or Wiring issue to the pump... Good Luck
You may want to try to see if the car will start while you spray starting fluid down the throttle body. If it doesn't, the problem may not be the fuel pump at all. There is an idle air control valve bolted to the front of the throttle body that can keep the car from starting as well.
If the car starts with the starting fluid, you might want to change your fuel filter. It's mounted under the car near the passenger rear door.
Other things to check, do the dome lights work? If not change the fuse for those and try again. When its quiet around you turn the key all the way on but don't crank the engine. You should hear the pump kick on. But if the fuse is blown for the Dome lights and the Radio it also kills the ECM which kills the fuel pump since the ECM turns on the fuel pump. And the 91 does not use a carb, its a Throttle body injection system.
your TPS is the fault. The TPS(throttle position sensor) is located on the throttle body and is responsible for your idle speed. when this is faulty the engine speed sensor tells the ecm that the engines is losing rpm and then the ecm tells the fuel pressure regulater to give more fuel so this loads the throttle body up and you basically are flooding the throttle body and that's when ypou get a bog down. change the tps and this will solve it...please rate the solution..........thanks