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1) Run out the tank of gas completely, and then fill it up with something else.
2) Check your plugs, maybe they were gapped wrong, or you just got a shitty plug. They're not too expensive, if you can stomach the cost, replace them again.
3) Check your coilpacks. I thikn they should be fine, since if they were misfiring, you'd get a code from them potentially. However, at 94K KM, if you can afford it, I'd change them too.
4) 4) MAP Sensor is only $150 from ECS Tuning, so, I'd go this route next if
5) 02 Sensors aren't too overly expensive. Replace them if you can/want.
You could also look into getting an ECU Update Flash, to the new 240/241 Software I believe from Alex @ Alpine.
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