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rough idle

eddyvera2000
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eddyvera2000 New Member

eddyvera2000

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I recently did a spark plug and wire replacement on my 2019 Silverado 5.3 with 70 k miles.
I got the original acdelco spark plugs and wire for it.

I ran them with the pre-gapped of .035

after the truck felt a bit with a rough idle
so I correct the gap size. they were pre-gapped to .035. and the Manuel called for .037 - .043.
I corrected the gap size to .04
I did the replacement Because the truck felt a bit shaky. but not to much.
after the replacement I found out that the harsh gear change from 1st gear to 2nd gear went away. 
but my truck is still idling a little bit "strong" 

I noticed after the fact that the original spark plugs were at a .037 gap size
but I need help determining if its the gap size issue or something more?
anyone else having the same issue?

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