On my swap, I have put about 700 miles on it and have worked out most of the major problems. Most of the time, it pulls hard, however ever once in a while, when I go to accelerate it stubles and feels like there is zero power but with very small spikes in power. My main realy was bad, however, I resoldered where a solder joint was cracked. Timing has been set correctly. I am thinking that it may be something with fuel. has anyone else had a problem like this.