Ok, Im not entirely sure its a misfire although it could be.
In 4th/5th gear, there is some vibration through the steering and with the window down, you can here the exhaust note is rough, sounds like its misfiring abit.
As soon as you lift off the power, it smooths out completely and as you reapply the power, the vibration comes back as you increase the load progessively.
This doesnt happen in the lower gears in the same way although in 3rd gear and 1200-1600 rpm, it also misfires abit under load.
In the lower gears though, it pulls smoothly although that being said, it may just be that in higher gears its more pronounced as the little engine is working harder.
Its possible its EGR if it has one as there is evidence from service records that it has been cleaned several times over the last 5 years.
I also wondered about an engine mount or whether it could just be duff plugs/leads OR something ive not yet thought of, fuel delivery maybe?
Any clues? The bit that puzzled me was how smooth it was on engine braking, which made me think of fuel maybe. I have thrown some Wynns injection cleaner through as an experiment, not gone far yet though.
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