A fuel filter would not have an effect on one cylinder
& you know how long it was in the car
It could be there 3 to 5 years & be just fine
Don't assume that a code last time that pointed you to a bad
coil will happen that way again.
Codes don't really tell you to change anything
You could have a code for #5 & walk a new coil for 4 cyl's
until you get to # 6 now you found the bad one.
You have several coil packs that feed more than one
plug, you have more to consider
I approach this the way I am, as you most likely
can not test anything, because you lack the proper
equipment ,so you have to do things the hard or longer
way of trial & error. Just don't throw money & parts at
it in doing so
Are the O2 Sensors really old? Over 80,000 miles
Do you have any vacuum leaks including exhaust before
the O2 & converter?
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