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update Fuel filter changed ( inline) Nada Regap plugs Zip New plug wires 97% cured. Any other places to check to get total resolution to this?

Background info Tahoe has 200k miles Changed sparkplugs and added 10 gallons of crappy gas from my bucket truck that had been sitting for some time on same day. Motor stumbles a bit, seemed to help adding a couple cans of sea foam to the gas. Motor stumbles quite a bit more now that the...