A high idle in a 1993 Mercedes 190E can be caused by several factors, including a malfunctioning idle air control valve, a vacuum leak, or an issue with the throttle position sensor. Additionally, a dirty or faulty mass airflow sensor could disrupt the air-fuel mixture, leading to an elevated idle. It's also worth checking for any trouble codes that may indicate specific problems. Regular maintenance and diagnostics can help identify and resolve the issue effectively.
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