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have you checked how much fuel pressure you are susposed to have. My jimmy requires 125 to 150 psi the fuel pump whines all the time or as it cycles. research how much fuel pressure you are susposed to have. then go on from there.
Fuel injection needs 20-30 pound pressure to fire the injectors. Try to check pressure before filter. If its low your pump is no good. If its ok then you have pressure drop after the filter. Filter on backwards or clogged.
ive found many of these cars with this problem, first remove vacuum hose form fuel preasure regulator this is located on injector rail, start car and see if gas is leaking from fitting for vac hose , if so replace regulator, the next thing is to make sure the throtle body is clean, use throtlebody cleaner and tooth brush to clean, and last would be the idle air control valve, this valve keeps the idle and adjusts it when needed. hope this helps,