1992 Chevy Blazer Surging

Tiny
DALEB
  • MEMBER
  • 1992 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 154,156 MILES
The engine is surging at an idle, and does not want to take fuel. I have changed the spark plugs, wires, distributer, cap and rotor, map sensor, throttle positioning sensor and fuel filter. The engine surges and wants to die at an idle. At a stop you have to feather the gas and hold the brake. Once you take off it will stay running. Sometimes it takes it a while to come up to speed, other times it is fine. If I unhook the vacuum to the map sensor it idles fine. I have also changed the intake gasket and throttle body gaskets. What else can it be?
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Friday, June 13th, 2008 AT 10:35 PM

1 Reply

Tiny
OBXAUTOMEDIC
  • CERTIFIED MECHANIC
Hello,

Check for a Vacuum leak and/or Colapsed Vacuum Line.
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Saturday, June 14th, 2008 AT 11:08 AM

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