Fuel System:
* Fuel injectors: Clogged or failing fuel injectors can cause a misfire and rough running. This is a common culprit.
* Fuel pump: A weak fuel pump might not deliver sufficient fuel pressure, leading to a lean condition and poor performance.
* Fuel filter: A clogged fuel filter restricts fuel flow, causing similar symptoms.
* Fuel pressure regulator: A faulty regulator might deliver incorrect fuel pressure.
Ignition System (despite the tune-up):
* Distributor cap and rotor: Even with new wires and plugs, a cracked or worn distributor cap or rotor can still cause misfires. These are relatively inexpensive parts to check.
* Ignition coil: A failing ignition coil might not provide sufficient spark to all cylinders consistently.
* Incorrect spark plug gap: While you say the plugs were adjusted, double-check the gap is correct for your engine. An incorrect gap can significantly affect performance.
Other Potential Causes:
* Vacuum leaks: Small vacuum leaks can disrupt the air/fuel mixture, causing rough idling and power loss. Inspect all vacuum hoses for cracks, splits, or disconnections.
* Mass Airflow Sensor (MAF) sensor: A dirty or faulty MAF sensor provides inaccurate air flow readings to the engine computer, leading to a poor fuel mixture.
* Throttle Position Sensor (TPS): A malfunctioning TPS gives the computer incorrect information about throttle position, affecting fuel delivery and idle.
* Engine coolant temperature sensor: An inaccurate reading from this sensor will affect fuel mixture calculations.
* Catalytic converter: A clogged catalytic converter can restrict exhaust flow, leading to power loss and potentially rough running.
* Oxygen sensor: A bad oxygen sensor will cause the engine to run rich or lean, affecting performance.
Troubleshooting Steps:
1. Check for error codes: Use an OBD-I scanner (appropriate for 1994) to retrieve any diagnostic trouble codes (DTCs) stored in the car's computer. These codes can point you directly to the problem.
2. Visual inspection: Carefully inspect all vacuum lines, hoses, and connections for leaks or damage.
3. Listen carefully: Pay attention to the sounds of the engine. A ticking or clicking sound might indicate a specific cylinder problem.
4. Check fuel pressure: A gauge is needed to measure fuel pressure. This requires some mechanical knowledge.
5. Test the MAF and TPS sensors: These sensors can be tested with a multimeter, but you will need to consult a repair manual for specific instructions.
Recommendation:
Unless you have significant experience working on cars, it's best to take the Camaro to a qualified mechanic. They have the tools and expertise to diagnose the problem accurately and efficiently, saving you time, money, and potential frustration from chasing down multiple possibilities. Blindly replacing parts without proper diagnosis can be expensive.
