My '94 classic is giving me a hesitation when cold and accelerating, and it had a longer spell of that today. Colder makes it worse, it idles fine, it drives fine, but on acceleration it can bog like it is not getting spark, then it takes off fine. The vacuum advance works. Feels electrical. Does not ever do this unless accelerating from start. I'm at a bit of a loss at what to look for or how to test. Thanks!