Not enough horse power or in the wrong gear.
because the gas goes to the back of the tank making the fuel tank look empty. the fuel pump cant pump the gas when there's not enough there
You may need rotors
At what point does it lose power? As you're driving? When you come to a stop? plugged converter
the timing could be off. check the timing
Could be a restricted catalytic converter A restricted cat would cause a loss of power but not the vacuum leak sound. I would look into the Idle Air Control Valve-IAC, battery voltage, and O2 Sensor. The IAC controls the amount of air bypassing the throttle body, though it is likely the IAC is not the real problem. A low battery voltage on starting can cause improper IAC calibration. A bad O2 sensor will also cause problems and turned out to be the problem on my truck.
that would probably be the transmission. It may not qite be working right.
what would cause a 150cc scooter to lose power?
I would say it's a slipping clutch
NO it would not.
No
You may need rotors
A defective catalytic converter can do that.
a vac leak
change the fuel filter
the shaft inside the tranny is broke.
if you have a carborator, it may have to be adjusted
If the car has high miles, try checking the catalytic converter. If it is clogged it will cause the vehicle to lose power.
Vapor lock!