175kms, good condition. Vehicle sat for 10 days over Xmas. When started I noticed a slight to moderate, sporadic lurching, misfire. No particular rhyme or reason. No code triggered. No dealership where I live. Tried injector additive to gas, no luck. Local mechanics no help. Got a tip that someone with the same vehicle has a a similar problem with no warning code and replaced the knock sensor. DId that yesterday and $300 later no luck. I am frustrated. Now looking at maybe sourcing a second hand oxygen sensor. Any thoughts or ideas appreciated. One weird anecdote; when you hammer the thing it responds without an issue, then when you back off to steady state driving it comes back. Also seems to be worst when slowly accelerating in 1st and 2nd gears. Thanks