* Ignition System: This is a prime suspect. Problems could include:
* Worn distributor cap and rotor: These components distribute the high voltage to the spark plugs. Wear leads to misfires, causing shaking and power loss.
* Bad ignition coil: This component boosts the voltage for the spark plugs. A failing coil results in weak or no spark.
* Worn or faulty spark plugs and wires: These deliver the spark to the combustion chamber. Worn plugs misfire, and damaged wires can cause shorts or interruptions in the spark.
* Ignition module: This controls the ignition timing. A faulty module can cause erratic operation.
* Fuel System:
* Clogged fuel filter: Restricts fuel flow, leading to poor performance and shaking.
* Fuel pump failure: Inability to deliver sufficient fuel pressure.
* Clogged fuel injectors: Prevent proper fuel delivery to the cylinders.
* Vacuum leaks: Can disrupt the fuel/air mixture, causing poor running and shaking.
* Engine Mechanical Issues:
* Worn or broken engine mounts: These support the engine; if damaged, the engine can vibrate excessively.
* Balance shaft issues (if equipped): A problem with the balance shaft can cause significant vibration.
* Internal engine problems: More serious, this could include things like worn bearings, low compression, or a damaged connecting rod. This is less likely to be the sole cause of the problem if it was gradual. If it's a sudden failure, it's more likely.
* Transmission Issues (Automatic):
* Low transmission fluid: Can cause slipping and rough shifting, leading to shaking and power loss.
* Transmission problems: More serious transmission issues could be the culprit but usually present other symptoms besides just shaking and loss of power.
Troubleshooting Steps (in order of increasing difficulty/cost):
1. Check the obvious: Look for any obvious leaks (fuel, oil, coolant). Check the fluid levels (engine oil, transmission fluid, coolant). Listen carefully to the engine while it's running; unusual noises can offer clues.
2. Ignition System Check: Start by visually inspecting the distributor cap, rotor, spark plug wires, and spark plugs. If they look worn or damaged, replace them. A mechanic can test the ignition coil and module.
3. Fuel System Check: Check the fuel filter; if it's old, replace it. A fuel pressure gauge is needed to check the fuel pump's pressure.
4. Engine Mounts: Visually inspect the engine mounts for damage or looseness.
5. Professional Help: If the above steps don't resolve the issue, you'll likely need to take it to a mechanic. They have the tools and expertise to diagnose more complex mechanical problems.
Important Note: Driving a vehicle with these symptoms is risky. The shaking could indicate something serious that could lead to a breakdown or even an accident. Minimize driving the vehicle until the problem is diagnosed and repaired.
