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Engine shaking during a cold startup in a 1993 Geo Prizm 1.6L can be caused by several factors, including worn engine mounts, ignition system issues, or fuel delivery problems. Cold temperatures can exacerbate these issues, causing irregular combustion or misfiring. Additionally, a dirty or malfunctioning idle air control valve might prevent the engine from maintaining a stable idle when cold. It's advisable to check for any diagnostic trouble codes and inspect the ignition components, fuel system, and engine mounts for signs of wear or malfunction.

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3w ago

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