autocity when i mess with the timing the only thing that changes is the idle note it acts the same at cruise. See the biggest prob.
I have is that the ignition and fuel delivery i have been told is that they act the same so i messed with the timing same ole.
i changed the jet from a 73 to a 68 that the next size down that i have it got worse but with the 73 its to rich out hte tail pipe