MY RPM'S RACE UP TO 6000 WHEN I START MY ENGINE AND THEN IT WILL USUALLY DIE

  • Tiny
  • Jimmy.46
  • 1989 GMC SIERRA
  • 235,000 MILES

99 GMC Sierra 5.3 235000 miles. When I start it up the RPMs jump up to 5000 to 6000 and back down to under a 1000 and will usually die. If it does not die it is a real low rough idle. When I try to drive the vehicle it will gradually accelerate until I reach about 45 mphs. Without pressing accelerator and start surging. When I come to a stop it surges. I have replaced Intake manifold gasket, Mass air flow sensor, fuel regulator, throttle position sensor and pcv valve.

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Saturday, May 5th, 2012 AT 10:16 PM

1 Reply

  • Tiny
  • Rasmataz
  • MEMBER

Clean the idle air control valve and EGR valve and see what happens

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Saturday, May 5th, 2012 AT 10:21 PM

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