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Intermittent stalling while driving, seems like a lack of…

Customer Question
Intermittent stalling while driving...

Intermittent stalling while driving, seems like a lack of fuel. after sitting for a few minutes it will run and then not have an issue for days. the other night while driving in rush hour traffic it stalled multiple times, which really sucked. haven't had an issue since then, but I don't feel safe driving it

Mechanic's Assistant: Is the check engine light on? Does the car stall at idle or when driving?

Yes, p0171 & p0174. I will be checking the mass air flow sensor today as well.

Mechanic's Assistant: What is the model/year of your Chevy?

Would that be a better area to concentrate on over the fuel pump? 2003 Chevy Suburban 5.3 Flex Fuel Z71

Mechanic's Assistant: Are you fixing your Suburban yourself? What have you tried so far?

I haven't done anything yet, today is the day

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

This is my issue

Submitted: 8 months ago.Category: Chevy
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Answered in 5 minutes by:
12/23/2017
Chevy Mechanic: Dan, Technician replied 8 months ago
Dan
Dan, Technician
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Chevy Mechanic: Dan, Technician replied 8 months ago

You are on the right track, it sounds like problem is either fuel pump or mass airflow sensor. You can unplug the mass airflow sensor to see if it stops stalling, if so you can use approved cleaner to try and clean, if that doesn't help then it will need to be replaced. If it still stalls with mass airflow sensor unplug then fuel pump is probably failing, to know for sure you will want to monitor fuel pressure while it stalls and if pressure drops when vehicle stalls or is lower during time it won't restart then replace the fuel pump. Let me know if you have questions, thanks.

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Customer reply replied 8 months ago
Thanks Dan. the mass air flow sensor would be easier than replacing the fuel pump. I'll go buy a pressure gauge for we can monitor the fuel pressure. when should I change the plugs and what kind works best. I have 200k on this truck and about 60k on these plugs
Chevy Mechanic: Dan, Technician replied 8 months ago

Replacing plugs every 100k is what manufacture recommends and use AC Delco Part number 41-985 Let me know if you have questions, thanks.

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Chevy Mechanic: Dan, Technician replied 7 months ago

Ever get it figured out? Please do not forget to rate answer. Thanks.

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Customer reply replied 7 months ago
I cleaned the Mass airflow sensor and the rough idle went away.....for 4 days. The other night after driving on the highway the car stalled again, thankfully before entering the Eisenhower Tunnel. After a minute it started and ran fine. Today it warmed up to 50 and no rough idle. I've been out of town so haven't had time to do anything else, just watching it carefully until Monday when I will have a chance to look at it again.
Chevy Mechanic: Dan, Technician replied 7 months ago

If problem keeps happening see if it runs better with maf unplugged if so replace. Cleaning doesn't always help and a failing fuel pump doesn't usually allow vehicle to restart right away. Let me know if you end up needing anything, you can reply to this answer at any time without additional fees. Thanks.

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Customer reply replied 7 months ago
Thanks Dan
Chevy Mechanic: Dan, Technician replied 7 months ago

No problem, have a good weekend.

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