Call or email Mel Mallory at FS Ignition and explain your simptoms. My guess is the igntion module is working perfect. It either works or it doesn't.
Timing this distributor correctly is important. It can be a little sensitive but it should not cause misfiring if it is off a little. You indicated the distributor button was changed. Make sure it is tight. If it isn't your distributor might have moved without you realizing it. You said you changed the coil it might not have the correct resistance value for your FS distributor module. My main guess is you have a fuel flow problem. First check if any filters you have in the line are blocked then check the carburetor for dirt or blockage. The high speed nozzle could be partially restricted or if this is a new carburetor it could have the wrong size nozzle which could restrict the flow at higher rpm's.
