Ran fine for about 3 weeks. Has developed a problem when running over 4,100 rpms engine will lose power. Never stalls or misfires, just slows down like the timing is retarding. When engine slows down fuel ball is normal, tried pumping it, no change. Put vac gauge on fuel supply line, never exceeded 2 inches. Tried pushing key to prime position when problem is occuring, no change. Looking into carbs when problem starts, no visible change in the amount of fuel being drawn. Attached inductive timing lite to each plug wire when problem is happening, flashes on all cylinders. Suspect module is retarding timing, but the problem is quite predictable and seems to occur at all engine temps, from cold to hot. I am an automotive tech, and most module type failures I have encountered have not been as consistant and are usually affected by temp. Any help would be great. My local dealer has a four week backlog before he can even look at it, I'm hoping I can speed up the process.