High idle and stalls

1999 CHEVROLET BLAZER
139,780 MILES • 4.3L • V6 • 4WD • AUTOMATIC
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BLAZERS99
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I put in a new fuel regulator new gaskets new crank sensor new pigtail for crank position sensor it ran fine then the regulator went out so I put new one in and gaskets. It idles at 3,000 and if I goes under it shuts off unless I unplug mass air flow sensor then it steadily idles at 3000. would the upper intake gasket be leaking or did I mess something up cleaning the MAF and IAC and TPS?
Apr 15, 2017 at 6:09 PM
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STRAILER
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It sounds like something got messed up, is ti check engine light on? If not please run the codes anyway to see what part we need to look at.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Recheck the TPS connector to make sure its plugged in all the way,

Please let us know what happens.

Best, Ken
Apr 18, 2017 at 11:53 AM
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STEVE W.
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Vacuum leak would be a start. The gasket for the injector to upper intake and the upper to lower are common issues, if they get moved just a bit they leak.

Then the IAC which is nothing but a computer controlled vacuum leak! Also check the EVAP purge solenoid. The plastic can easily get cracked on them and leak.
Apr 19, 2017 at 9:57 PM
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