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hey there, so ive got an issue that i just cant seem to figure out. the problem is its a periodic issue so i cant every "make" it happen it kind of just comes and goes when it wants too. under load i cant get over 3-4k rpms, in any gear. 6th gear tops out at 90km/h and i can give it all the gas i want and it just bogs a bit and stays at the same rpm. i can rev it all i want in neutral and it sounds healthy but as soon as its in gear and moving its a no go.

narrowed it down to some sort of ignition issue but thats as far as i can get.

any ideas would be very appreciated