Rough idle when cold

[Ben626]

I have a 2002 Gmc Sierra with the 6.0, I been doing some research on this.

When it's 20 degrees or colder it has a rough idle for about 30 seconds. I'm founding out its either intake gaskets or maybe mass air flow sensor.

But when I plug the truck in it starts and runs fine. I didn't think plugging it in would affect the intake gaskets or air flow sensor.

 

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[00Silverado4x4]

How is your fuel pressure?

[Ben626]

I never checked fuel pressure. I did clean the mass air flow sensor with cleaner. Seems to be better.

 

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[waumo1]

Our 2002 Yukon (5.3) would idle rough and stumble for a few seconds from a cold start 20F or so. I finally replaced the MAF and it was fixed.

Cleaning the MAF did no good and checking for manifold leaks turned up nothing.

[certified22]

I replaced my MAF twice just to be certain along with a long list of other parts be the guy at orielys said was wrong with my truck and why it would idle rough when cold and throw certain dic s when cold doing this though to try and avoid changing intake gaskets should hAve just changed intake gaskets its like 99% chance that it's your intake gaskets