The engine runs good up to about 3800 rpms. When the throttle is increased a little the engine stars to miss fire. Back off a little and it runs fine. We have replaced the fuel line and filters from the tank to the engine including the filter on the engine. We have disconnected the three temperature sensors and it made no difference. We have checked the spark with a timing light at low & high speed and can see no difference between the cylinders.
Looking for advice on what to check next and how to isolate the problem.
Looking for advice on what to check next and how to isolate the problem.