Ignition System:
* Spark Plugs & Wires: Worn, fouled, or damaged spark plugs or ignition wires are a common cause of misfires, leading to skipping. This is a relatively inexpensive and easy fix.
* Ignition Coil: A failing ignition coil can't provide sufficient spark to one or more cylinders, causing a skip.
* Distributor Cap & Rotor (if equipped): Older vehicles may have a distributor. Cracks or corrosion in the cap or rotor can disrupt the spark delivery.
Fuel System:
* Fuel Injectors: Clogged or failing fuel injectors can deliver an inconsistent fuel spray, leading to misfires and skipping.
* Fuel Filter: A clogged fuel filter restricts fuel flow, causing a lean condition and poor performance, including skipping.
* Fuel Pump: A weak or failing fuel pump might not deliver enough fuel pressure, leading to skipping, especially under acceleration.
Engine Issues:
* Vacuum Leaks: Leaks in the vacuum system can disrupt the air/fuel mixture, resulting in misfires.
* Mass Airflow Sensor (MAF): A faulty MAF sensor provides inaccurate readings of air intake, leading to an improper fuel/air mixture.
* Throttle Position Sensor (TPS): A malfunctioning TPS provides inaccurate information about throttle position, leading to poor engine performance.
* Engine Compression: Low compression in one or more cylinders can cause a misfire and skipping. This is a more serious issue.
Transmission Issues (less likely to cause skipping, but possible):
* Transmission Problems: While less likely to manifest as *skipping*, transmission issues could cause hesitation or jerking that might be misinterpreted as skipping. This is less likely than engine issues.
Troubleshooting Steps:
1. Check Engine Light: If the check engine light is on, have it scanned for diagnostic trouble codes (DTCs). This will often pinpoint the problem area.
2. Visual Inspection: Inspect the spark plugs, wires, distributor cap and rotor (if applicable) for visible damage or wear.
3. Listen to the Engine: Listen for unusual sounds like ticking, knocking, or sputtering.
4. Test Drive: Pay attention to when the skipping occurs (acceleration, deceleration, specific RPM range). This can help narrow down the possibilities.
Important Note: If you're not comfortable working on your vehicle yourself, it's best to take it to a qualified mechanic for diagnosis and repair. Ignoring a skipping engine can lead to more serious damage.
