However, a misfire and hesitation can have many other causes, including:
* Bad spark plugs: These are the most common cause, often worn, fouled, or the wrong heat range. You should check these *before* or *at the same time* as the wires.
* Ignition coil(s): A failing ignition coil can't provide sufficient voltage to one or more cylinders.
* Distributor cap and rotor (if equipped): These parts can crack, corrode, or wear, leading to poor spark distribution.
* Ignition control module (ICM): This electronic component controls the ignition system. A faulty ICM is a common source of problems in older vehicles.
* Crank sensor or cam sensor: These sensors tell the computer the position of the crankshaft and camshaft, crucial for precise ignition timing. A faulty sensor can cause misfires.
* Fuel system issues: A clogged fuel filter, low fuel pressure, or problems with fuel injectors can also lead to misfires and hesitation.
* Vacuum leaks: Leaks in the intake manifold or vacuum lines can disrupt the air-fuel mixture.
Therefore, replacing the spark plug wires is a relatively inexpensive troubleshooting step, but it's not a surefire fix. It's best to perform a more thorough diagnosis to identify the root cause. Start with a visual inspection of the wires, plugs, distributor cap (if applicable), and look for any obvious signs of damage. If the wires look bad, replace them, but be prepared to investigate further if the problem persists. A mechanic can perform a more comprehensive diagnostic test to pinpoint the exact issue.
