What are some symptoms of a clogged fuel filter?
The effect would almost certainly be similar to running lean - ie, if not enough fuel is making it to combustion your fuel to air ratio will be that of a lean mixture
Effects of lean mixture include

Overheating
Knocking sound when running, perhaps even popping/backfiring from exhaust
The RPM will &quot;hunt&quot;, meaning it will increase/decrease attempting to find a stable RPM
Slow to pickup, ie when increasing throttle it will not change quickly RPM as it should