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Old 09-09-2018, 04:41 PM   #3
Ol Blue K20
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Join Date: Nov 2012
Location: Vacaville , CA
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Re: 89 suburban idle help

I have the same problem on a 93 C1500. The fuel pressure is 12 lbs but dropped to 0 withen a second after fuel pump shut off. Ireplace the pressure regulator and the stumble is almost gone but still there a little. It'll be nice to see some ideas.
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