Run the fault codes
look for problem with injectors and wiring and low fuel pressures.
Testimonial: "would fuel pressure regulator be the problem if so where is it located i put a different fuel pump in it still does the same thing"
it is always best to follow the answer ---have the fault codes read first--it does away with costly guesses
have a pressure test done on the fuel system as that will reveal faulty regulator , pump and filter problems.
Like Bill said, the codes can point you to the problem area or circuit. Beats chasing ghosts all day .
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Engine stalls or RPM
fluctuates at idle up and down or dies near idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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