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What would make a car hesitate and choke?

Several factors can cause a car to hesitate and choke. Some common causes include:

1. Spark Plug Issues: Faulty or worn-out spark plugs can lead to misfires, causing hesitation and choking.

2. Fuel injector problems: Clogged or dirty fuel injectors can disrupt the proper fuel flow, resulting in hesitation and choking.

3. Airflow Issues: A restricted airflow can lead to hesitation and choking. This can be caused by a clogged air filter, dirty throttle body, or a faulty mass air flow sensor.

4. Oxygen sensor Malfunction: A faulty oxygen sensor can provide incorrect air-fuel mixture information to the engine's computer, leading to hesitation and choking.

5. Catalytic Converter Problems: A clogged or damaged catalytic converter can restrict exhaust flow and cause hesitation and choking.

6. Transmission Issues: Transmission problems, such as worn-out clutches, slipping transmission bands, or faulty torque converter, can also lead to hesitation and choking.

7. Vacuum leaks: A vacuum leak can disrupt the proper air-fuel mixture, causing hesitation and choking.

8. ECU (Engine Control Unit) Issues: Malfunctions in the engine's control unit can affect various engine functions, including fuel injection and ignition timing, leading to hesitation and choking.

9. Faulty Ignition Coil: A faulty ignition coil can lead to weak spark or misfires, resulting in hesitation and choking.

10. Fuel Pump Problems: A weak or failing fuel pump can lead to inadequate fuel pressure, causing hesitation and choking during acceleration or high-speed driving.

It's important to note that diagnosing the exact cause requires a thorough inspection by a qualified mechanic, as several factors can contribute to hesitation and choking.