Seemingly out of nowhere our 06 3010 will not run over 18mph, full throttle, hot or cold.
Starts and runs as always just won't go. Added fresh fuel but didn't help. Tried driving in low for a bit then back to high but still 18 mph tops. Last week it would run closer to 29-30. Has 700hrs on it. Don't hear any odd noises or see any leaks.
No idea where to start diagnosing.
Don't really have an available repair shop nearby so it'll be on me to repair whatever is wrong.

Any suggestions?

Thanks,
Mze