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so i drained the tank (hotwired fuel pump, hooray) and put in 10 gals of premium. should offset what was left in there. swapped in a new fuel filter and new plugs, the old plugs were (suddenly) dirty as hell but they fired when i tested them. also compression gauge showed ~175psi in all cyls. didn't have time to put any miles on it last night after this, but this morning i took her to work (30mi?)...marked improvement, but still not perfect. seems like that 4th cyl kicks in at higher rpms, then will stay going for a while when i drop them, then after a bit it goes back to how it was, then back to good, etc.the rattly noise is worrying me...though i'm thinking it could be the timing chain guides? wasn't that a common issue in ka24de's? is this possible and if so is it a case of 'fix this or the chain breaks' or is it just an annoyance?
so what could be left wrong with this...maybe a bad O2 sensor? could that cause an issue like this? it looks like an easy replacement, right out in the open.
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