SubGothius I have used both (hotter) NGK5 & (colder) NGK6 plugs in my G54B engine ~ the colder plug fouls black quickly causing poor running 'n very black tailpipe ~ the hotter plug runs ok and the tailpipe is very dark gray here in Hawaii traffic...
Next time I change plugs will try to find genuine (non-fake) double platinum type plugs, NGK brand if possible...
Ethanol Gas might be affecting things..? I've read ethanol gums up the fuel system and causes rust inside the fuel tank, maybe..?
https://www.bobvila.com/articles/how...gasoline-last/
According to the U.S. Energy Information Administration, most gasoline sold in the U.S. is E10 gas made of 90 percent petroleum-based gas and 10 percent ethanol (ethyl alcohol). The shelf life of gas that is ethanol-blended is usually about 3 months maximum because ethanol oxidizes pretty quickly. Because ethanol is hydrophilic (aka, water-loving), it will also readily absorb any water or humidity in a sealed container resulting from condensation, causing both moisture contamination of the fuel and the eventual separation of the fuel into distinct gas and ethanol layers. Generally, the higher the ethanol content in the gas, the shorter its shelf life, so E15 (15 percent ethanol content), E20 (20 percent ethanol), or E85 (85 percent ethanol) gas will expire sooner than E10 gas will...
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I think there is a SHELL Station in Kaneohe town here that sells pure gas with zero ethanol ~ maybe I should run my tank empty then fill-up @ that Shell Sta at least twice..? Google can probably identify gas stations that sell ethanol free fuel..?
I did two fill-ups of 92 octane gas, it made the truck run like SH_T then going back to 87 octane the problem went away..! LESSON Learned
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My Haynes manuals Chrysler FSM owners handbook are not available for my use right now but I will eventually check what spark plugs they all recommend...
My Truck's MISFIRES: (always different & sometimes never happening)
My truck's sensors have been replaced with the exception of the air intake temp sensor inside the air cleaner case & the Thermo-Valve temp sensor that regulates vacuum to the EGR among other vacuum duties (if any..?) I don't trust the electrical connectors to these two sensors either old brittle etc...
My truck has a new China cylinder head & Mikuni carb rebuild during the pandemic...
Wish I could find the EXACT cause/causes of these intermittent & often different acting misfires ~ a new vehicle with computer codes is easier to diagnose <--- IMHO
Hope we discover best spark plugs for these trucks
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