When I first start out in the morning my puch has terrific acceleration. It's running a 70cc kit, a techno boss exhaust, and a 14mm bing with a 78 jet. It also has a high flow air filter made from a car's crankcase breather. Once it's been running for a while though, say a mile or two, the acceleration slacks off, and it has a tough time holding an idle. It will be idling nice and high (which is where I likes it) and then it will just quit. Not slow down and splutter, just die out as if someone took the fuel away. It's very confusing.
When I first start out (after having let it warm up as well) I do not need to use the pedals at all to give it a boost. After I've been going a bit, I do. Any ideas?