There is no hose on that regulator -so that is not your problem.
You should start by cleaning the throttle bodies and checking for air leaks. Also check the oil temp sensor on the rear jug. Make sure the two-wire harness end is clean and tight as well as the sensor plug. Clean and retighten battery terminals and check the main ground.
If you still have problems report back with fuel pressure, compression, charging voltage
The Vic Shop, Inc