'92 Loyale - Difficult to start, rough idle, and stalling/no power while in gear.

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For SPFI models, the fuel pressure discharge from the fuel pump is 36-50 psi. After the regulator is 20-24 psi @ 700rpm. The regulator drops the high pressure from the pump to a usable pressure for the injector. So there is a high pressure side and a low pressure side, separated by the fuel pressure regulator on the throttle body.

Could be an issue with the fuel lines or filters. But most likely the fuel pump is tired and out of spec.