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2015 Chevy suburban rough idle

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      tpaulson96
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      Hey so short story is we moved to South Carolina from oregon in our 2015 Chevy suburban a couple weeks after moving here started having a rough idle with no codes. So replaced spark plugs and wires and clean intake and did fuel treatment. My #1 cylinder was super black but the rest were clean and normal? I checked that plug after a week and back to same condition. Also I noticed in oregon our oil pressure on idle was in the middle now it’s way lower like right above the quarter mark unlike oregon it has as the half mark. I’m really lost you can till something is wrong but I’ve checked the MAF too and it was good. Just super weird I have no codes. I know lifters are a problem but I have no codes I’ve read a lot about lifters and most people get codes? If anyone has insight please share!!!

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