More likely culprits include:
* Transmission problems: This is a very common cause. Worn-out clutches, low transmission fluid, or problems with the torque converter (if it's an automatic) are prime suspects. The jolting could be the transmission struggling to engage gears properly.
* Spark plugs and wires: Worn or faulty spark plugs or ignition wires can cause misfires that lead to a jerky acceleration.
* Engine mounts: Worn engine mounts allow the engine to move excessively, causing vibrations that translate into a shuddering feeling.
* Fuel injectors: Clogged or failing fuel injectors can lead to inconsistent fuel delivery, causing uneven power and jerking.
* Mass airflow sensor (MAF) or throttle position sensor (TPS): These sensors control the air/fuel mixture. A malfunctioning sensor can send incorrect signals to the engine control unit (ECU), leading to rough running and hesitation.
* Computer issues (ECU): In rare cases, a problem with the ECU itself could cause erratic engine behavior.
Diagnosis:
To determine the exact cause, you need a proper diagnosis. Here's what you should do:
1. Check the transmission fluid: Low or dirty fluid is a major possibility. Check the level and condition of the transmission fluid.
2. Check the engine mounts: Visually inspect the engine mounts for any obvious signs of wear or damage.
3. Check the spark plugs and wires: Inspect them for wear, damage, or fouling. If you're comfortable doing so, you can replace them yourself relatively inexpensively.
4. Consider a professional mechanic: The most reliable way to diagnose the problem is to take your car to a qualified mechanic. They have the tools and expertise to perform a proper diagnosis and pinpoint the cause. They can also check the MAF sensor, TPS sensor, fuel injectors and other components that are difficult for a non-mechanic to assess properly.
Don't ignore the problem. Continued driving with a transmission issue, for example, could cause significant and costly damage.
