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All coils and plugs have been replaced thus the reason I'm somewhat baffled. Which also led me to think fuel injectors.
The last coil and plug were changed within the last month. The previous were done by the previous owner which has receipts in the car but unsure of the dates at this time.
Check engine light is on and I get no codes for any coils or plugs. I'll have to look back at the code readings to see exactly what they were and what they represent. However, non, as I recall, affected a "miss or a surge!" I do recall one mentioning something regarding the catalytic converter or converter wiring.
I'd find the receipts and see if the valve cover gasket was repaired. There's a lot of misinformation on this car in regards to the COPS being a design flaw etc. If you don't fix what is causing spark plugs and COPS to fail, they will fail again on ANY CAR. The primary culprit is the valve cover gasket leaking, and sometimes the cowl seal.
I had a similar issue with my 2002, it was a leaky fuel injector
Did you check if oil is seeping into the coil bank ,use a scanner to find out which Cyl is missing most auto parts scan for free,and go from there ,weak point on that engine is the valve cover gaskets ,there’s an O ring for each cyl ,good luck !
My 2002 does the same thing periodically mostly on the driver side bank. The covers to access the coils are a pain in the but to get off so I have left mine off with no problems. Remove the coil and check for oil around the plugs. If you see any clean it out and also clean out the spark plug wire connections on the coil. I normally replace the plugs if I’ve gone this far. Hope this helps.
You can use it on a half tank unless the cleaner came in a metal can , cleaners in a plastic container isn’t that stronge for auto use !
