1989 GMC C1500 Suburban warms, idle speed gets high & s

1989 GMC C1500
180,000 MILES • V8 • 2WD • AUTOMATIC
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PPYRZ
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  • 1 POST
My 1989 Suburban 350 engine starts fine then after a few mins idling the engine idle speed picks up and then dies like it flooded/ran too rich. Cant start and run it again till it cools. Changed O2 sensor, air/fuel fliters, plugs etc. Is there a sensor switch that is messing up engine vaccum?
Vehicle is locked in a mountain valley by a rockslide so I cant get it to a mechanics shop. Thanks!
Oct 15, 2008 at 7:03 AM
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JNOVACK
  • ✓ASE Certified Mechanic
  • 723 POSTS
  • ASE Certified Mechanic
Inspect Choke Pulloff Inspect Choke Thermostat also inspect vacuum lines and Fuel System Pressure pcv valve plug wire to insure they are not to close to manifold or damaged
Oct 15, 2008 at 7:37 AM
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