Engines do not vibrate unless they starve on air or gas.
What might vibrate when you are slowing down is wore brake disks or faulty bearings.
3000
normal atf
shifts normal with normal driving conditions when driving hard transmission stalls.have to ease off gas to go to next gear
If you have a manual transmission, then simply the car's engine dies because you release the clutch too quicly. If your car is automatic than you might have engine or transmission problems.
You put it in drive and press the gas. It drives just like a normal automatic transmission.
in an automatic transmission when it shifts the belts that hold the planetary gears that control the gear ratios grab the next gear before it releases the previous gear. while the transmission is in two gears at once the engine doesn't provide the power to the transmission so with the lack of tension on the motor it allows it to build up speed before it slows back down when the transmission releases the lower gear What about a manual transmission? Is it normal for it to still do this same thing?
There are many reasons. Take it to a trans shop.
Chances are, particularly if this is an automatic transmission, you are low on tranny fluid. To check this, the engine needs to be at normal operating temperature and idling. Checking tranny fluid when the engine is cold and not idling will give a false reading, indicating that it is full ...
There is no transmission dipstick. Check fluid level by removing the inspection plug on the left side of the transmission. Only check fluid level with engine running otherwise fluid will overflow through the hole since fluid accumulates in pan with engine off. Normal level is to the top of the port. Also, if you have the automatic transmission on your 2003 CTS, there is no way to check the fluid level. See your owner's manual.
Have you checked the fluid level? Have you changed the filter and fluid as normal maintenance?
Of course my first question is, are you moving? If not, have you snuck up on it late at night? Is the engine running? It's very common for a tire to spin when the transmission is engaged and engine running, the main purpose of a transmission is to transmit the rotational power of the engine to the tires. You neglected to say whether the tires are in ground contact or not. If they are your idle is set WAY to high, if not, wheel spin is completely normal with either a manual or automatic.
Below 220 degrees .