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I have a 2006 sir it has a 6:0 in it had trouble with the…

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I have a 2006 sir...
I have a 2006 sir it has a 6:0 in it had trouble with the 4l60 trammision replaced it with a 4l80 now I am having trouble with 02sensors runs rough idling then it runs good does this every time you shut it off and crank it replaced 02sensors and mass air flow sensor any ideas running out myself
Submitted: 7 months ago.Category: Chevy
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Answered in 56 minutes by:
11/29/2017
Chevy Mechanic: Tim's Auto Repair, mechanic replied 7 months ago
Tim's Auto Repair
Category: Chevy
Satisfied Customers: 16,246
Experience: Have owned a repair shop for 25 yrs.
Verified

Hi, My name is ***** ***** for the delay.
I will do my best to assist you.

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Chevy Mechanic: Tim's Auto Repair, mechanic replied 7 months ago

To avoid asking you to do something you’ve already tried, can you tell me what troubleshooting steps you’ve already attempted?

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Customer reply replied 7 months ago
We have checked out all wires for connections and replaced 02senors and mass flow sensor
Customer reply replied 7 months ago
Will run good after a minute or so then shut it off and crank it again does the same
Customer reply replied 7 months ago
Your thoughts
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 7 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Chevy
Satisfied Customers: 24,071
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

There are quite a few things that could be going on and it will require some testing to determine exactly what is wrong, but it sounds as if you may be describing an inoperative upstream oxygen sensor heater, whether it's due to a wiring issue or a failure of a sensor.

Were the oxygen sensors replaced to try to repair this condition or was that unrelated?

Where did the sensors come from?
Have you checked for fault codes?

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