Why Does my Chevrolet Blazer 1991 Idle go Up after Three minutes of Running

1991 CHEVROLET BLAZER
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GARCIA55
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  • 1 POST
I start the Engine and after Three min. of running the idle goes up
Dec 23, 2011 at 12:31 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Clean and test the idle air control valve -start here
Dec 23, 2011 at 12:37 PM
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CODYMCNEAL
  • MEMBER
  • 1 POST
You need to replace your fuel pump
My k5 blazer was doing that and we talked to te mechanic about it and he said that it is proably the fuel filter so we replaced it and it fixed it.
Dec 27, 2011 at 12:34 PM
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