Tranny problem.
If its manual that would be the cltuch slipping.
With the car on, press the accelerator pedal.
Pressing on the accelerator increases engine rpm (revolutions per minute) which in turn increases wheel/tire rpm which increases vehicle speed.
Poor lubrication. Excessive rpm's. Defective piston. Problem with the wrist pin, bushing or piston rod.
Excessive engine RPM....low oil level.....engine component wear/stess/fatigue ....over heating....
Let's start with the basics. The internal combustion engine needs three ingredients for it to run properly. Fuel, air and Spark. The fuel mixes with the air in the combustion chamber and a spark is introduced via the spark plugs which causes the engine to run. RPM, which stands for revloutions per minute counts how many times the number 1 Cylinder fires. Every car has a specific firing order which causes the engine to run. for example a Chevy 350 and Oldsmobile 425 Cubic inch V8 have the firing order 1,8,4,3,6,5,7,2. When you press on the accelerator you (the driver) are giving the engine more fuel so the engine has to run faster to burn this extra fuel. thus the faster the engine runs, the higher the Revloutions per minute RPM.
Driving in low gears. Pushing hard on the accelerator ("flooring it"). Going uphill. Driving with excessive weight (like a trailer). Either shift up or lay off the gas to bring your engine speed down. This is a classic symptom of a "worn clutch" in a manual transmission vehicles. The friction disc cannot transfer power under load so it slips under load causing excessive engine reving. Excessive engine RPM at idle can be caused by a vacuum leak or by a stuck Idle Air Control (IAC) valve.
I think that happens when you are changing gears. If you make the engine goes to 3000 rpm and suddenly release the gas pedal and rapidly press down the clutch pedal. The rev would up. With very noisy sound. Isn't it?
Because your foot is on the accelerator
Excessive vibrating at low RPM can be caused by worn-out engine mounts. These pieces mount the engine to the frame of the vehicle, and when they wear out, the engine can literally lift and shift out of place when the car is running
check your accelerator...
As engine rpm increases so does pto speeed And if you tach your motor to an excessive amount of RPMs while the PTO is engaged, it will destroy that PTO, leading to zero PTO RPMs.