I've tried 2 different carburetors both cut out when the engine gets past 30-35 mph. Tried both with cone air filter and "c" clip in bottom position #5. The carburetors are DEKNI PZ30. They seem to work, it starts very good, it idles good, reving the engine from idle is no problem works well. Even to high rpms though I ain't done that but it will. Soon as you get on the highway reach 30-35 I tries to cutout, misses and runs poorly. Could this be the cdi or coil, I'm finding it hard to believe two carburetors having the same exact problems, both from different sellers. Please help