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RPM fluctuation at cold
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Question
morrislee
On cruise, I have a slight RPM fluctuation at start of a colder day, I have been getting he code P050D for Rough Cold Start (which is bad enough that I can notice when the code will trigger)
What could be the problem?
Truck is Sierra 1500 2014 with 5.3L ecotec3
If it is injector, what test can I run to narrow it down without taking off the intake manifold?
If it is the sparkplugs, how do I test them?
Please assist, thanks!
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