So my engine has been misfiring for a while now. I have replaced all spark cables,plugs, and coils. New down pipe, new TPS gasket, new plenum gasket. I took the car to a dealer near me and had them run a diag on it and came back with "there is something wrong with the relationship between plug 1 and 6." I have checked plug 1 and it looks fine, just some buildup on it compared to plug 3(used for comparison). The spark plugs are also getting spark. I don't have the time to look at plug 6 today (9/12/21). Any one have any ideas?