Want this question answered?
The price of pineapples in Hawaii is less likely to cause an engine to hunt or surge.
Depending on the vehicle, it most likely needs adjustment.
if you are not low on oil it could be a week oil pump most likely which can be detrimental in a hurry.
Most likely cause is that the rev limiter has cut in.
This most likely sounds like your water pump is on its way out. HAVE IT CHECKED IMMEDIATELY.
Perhaps a bug on windshield.
most likely an intake gasket
It is according to when you feel the vibration. If you have a vibration at higher speeds, your driveshaft could be out of balance. At lower speeds, you may actually have a cracked engine mount. Take it to a shop before it tears something up.
Timing needs adjustment is the most likely cause.
detonation.
Most likely it is the IAC (idle air control) valve. They sometimes will stick open or closed, giving you high idle speeds or no idle at all. Less likely could be a throttle position sensor, but they usually cause a check engine light too.
The spark timing might be too advanced. At high temperatures and RPM an advanced spark might cause preignition, and engine knock. That's only likely to happen if the engine is modified though. Other than that, check the air and fuel filters are clean, as the harder the engine has to work the more a clean flow of both is important.