Question about 1991 GMC Sonoma
2.8 liter hard to start running rough and rich
Remove the EGR valve and make sure there isnt a big peice of carbon stuck in the pintle.
Posted on May 18, 2014
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Posted on Jan 02, 2017
SOURCE: 2001 gmc jimmy
the ......fuel pressure regulator is on the fuel rail near the rear of the intake manifold it is round in shap. i would first check to see if you have a problem with your O2 sensors. also i would have the TPS sensor checked. the TPS is what controls your idle. it is located on the throttle body is black in color and has a weatherproof plug to it. please rate this.........thanks
Posted on Sep 01, 2008
Sounds like you might have a bad fuel pressure regulator.You can check it by pulling the vacuum hose off it and if you see any fuel run out then the regulator is faulty.
Posted on Nov 02, 2011
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