Just under 1.5 seconds.
You need a battery. The battery prevents surges when you rev your moped. It should be located under the seat. If there is one you need a new one.
it could be your valves or your engine
A flashing check engine light is usually a misfire.
Casket will age under its walking enviroment. This causes the engine to leak oil.
Short answer is no. There is however a technical service bulletin out for the speedometer needle shaking at 60mph and above, as well as erratic operation. It refers to check a ground that is on the drivers side of the engine, as it loses connection. It is under the intake manifold, towards the middle of the engine.
There could be loose rings in the engine that would cause this. The valves on the engine may also be chattering.
A ten second car could hit 60mph in under 10 seconds no problem. It could probably do it even if it had four flat tires and was pushing a dumpster.
If a 1985 Ford F150 5.8, with a replaced speed sensor, cruise control surges and with a working pedal switch, it is due to vacuum leak. Check on the cruise box under the hood for any leaks.
replace the ignition leads then try the coil aswell Plugs, wires, cap, rotor, injector, internal engine, etc.
A 350 engine will idle good but cut out and run rough while driving if there is a vacuum leak. This causes too much air to enter the engine under load.
Change the hall effect sensor . it is located under the distributor cap