Why does the car shake when the air conditioning is on?

[StColin]

The reasons why the car shakes when the air conditioning is on are: 1. Carbon deposits on the spark plugs cause the engine's output torque to decrease. 2. Carbon deposits on the intake valves lead to abnormal cylinder pressure, causing the car's computer to judge a cylinder misfire and automatically cut off the fuel supply. 3. Using the wrong gasoline causes severe engine carbon deposits. 4. A dirty throttle affects engine operation. The solutions are as follows: 1. Soak the spark plugs in a container with white vinegar for 2 to 3 hours, scrub off the carbon deposits with a hard brush, and then clean them with gasoline. 2. Drive at high speed above 4000 rpm to burn off the carbon deposits in the cylinders. 3. Choose the appropriate gasoline according to the car's compression ratio. 4. Clean the throttle.