Re: Weird and a little concerning
Well, have you checked the tire air pressures ha!
I don't know...if the filter is getting clogged, under low fuel pressure, it is not getting enough fuel, hence lean. At WOT, there is much more pressure allowing fuel to get thru the filter allowing it to run rich. What about your pressure regulator? I have learned a long time ago, there is nothing logical about our cars ha! I just do not see what spark plugs would have to do with it though?
Regardless, you still have a problem being your band-aid was enriching the mixture which normally you would not have to do. I agree, the A/F mixture guage is a engine savior, in so much as oil pressure and EGT!!!
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