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What makes a 90 GEO Storm GSI dual overhead cam fire on only 2 cylinders after I have replaced coil and plug wires distributor cap rotor set timing?

Here are some potential causes for a 90 GEO Storm GSI dual overhead cam to fire on only 2 cylinders after replacing the coil, plug wires, distributor cap, rotor, and setting timing:

- Incorrectly connected plug wires: Ensure the plug wires are connected to the correct spark plug according to the firing order of the engine.

- Faulty spark plugs: Even though you have replaced the spark plugs, they might still be defective. Check the condition of the spark plugs and replace them if necessary.

- Faulty distributor: Despite replacing the distributor cap and rotor, the distributor itself may be malfunctioning. Check the condition of the distributor, including its advance mechanism and ignition module.

- Ignition switch or wiring issues: The ignition switch or the wiring leading to the ignition system may have issues that prevent proper power supply to the ignition components, leading to the misfire.

- Fuel injector problems: If one or more fuel injectors are clogged or malfunctioning, it can cause a cylinder to misfire. Check the fuel injectors to ensure they are functioning correctly.

- Compression issues: Low compression in one or more cylinders can also lead to misfiring. Check the compression in each cylinder to ensure they are within the manufacturer's specifications.

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