RPM surging/missing on acceleration
Today as I was merging onto the freeway, the bike started surging/having major RPM fluctuations. There was also a fair bit of backfiring. Seems to happen whenever I give the throttle a good twist to accelerate, in any gear.
It may have been my imagination, but it seemed like the bike was vibrating more than usual while crusing. Also, it seems like the dash lights and headlight are dipping more than usual when I increase throttle, but that also might just be my imagination.
The problem continued after several stops to inspect; no leaking fluids or obvious loose wires. Bike starts up fine each time and idles cleanly.
My first guess is a fueling issue, but not sure where to start troubleshooting. Second guess is a stator failure?
Of note: there is moderate rust in the tank, and the previous owner installed two fuel filters to compensate.