Idles but will not stay running

BUCK KEHRING

MEMBER
1997 CHEVROLET TAHOE
5.7L
V8
4WD
AUTOMATIC
160,000 MILES

I have replaced the fuel pump, fuel filter, url injectors, MAP sensor, camshaft sensor, mass air flow sensor, IAC sensor, and the neutral switch in the transmission. Also has new plugs wires and distributor. The truck will start just fine but if I give it throttle it shuts off and if I put it in gear it shuts off. I cannot get the rpm's to climb is as if I flutter on the gas.

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,467 POSTS

Hi and thanks for using 2CarPros.com.

Based on your description, it could be a few things. The first thing I would suggest is to check for trouble codes. You may have already done that, but just mentioning it in case.

https://youtu.be/YV3TRZwer8k

If no trouble codes are found, I would then check for an engine vacuum leak. You have replaced a lot of things already but did not mention if you checked. Here is a link that shows how it is done:

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

If that checks out okay, then I would suggest checking for excessive back pressure from the exhaust, which could be the result of a plugged converter.

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Okay, with that being said, let me know what you find. If you already checked these things, let me know. Also, let me know if the problem started all at once or over time, if there is an odor from the exhaust, if you checked for a head gasket issue, engine compression, smoke from the exhaust. The list goes on. Anything you can tell me that may help.

Let me know.

Joe