Codes P0171, P0174, P0101

2004 CHEVROLET SUBURBAN
170,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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OKIONE80
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I recently took my vehicle to the shop to have codes pulled, and got P0171, P0174, P0101. I let them replace the intake manifold gasket and I did the plug, wires, air filter, and cleaned the MAF. MAF is only twelve months old. Truck will start now but does not want to idle. It will idle for a second and then stall. It also wants to stall when coasting. Any suggestions? Could it be bad o2 sensors? I replaced all o2 sensors twelve months ago.
Jan 23, 2018 at 3:39 PM
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STRAILER
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It does not sound like oxygen sensors are causing the problem. The codes are telling you the system is lean so there must be a vacuum leak or a cylinder misfire. Lets get started by following this guide to check for vacuum leaks.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please run this test and get back to us.

Cheers, Ken
Jan 25, 2018 at 10:13 AM