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Some details would help.
What year is the car, and what engine? Are you sure it's the 2.3L 8V engine shared with the much-earlier W201, or the 2.3L M111 DOHC engine? They use completely different engine management and fuel injection systems, and diagnosing running problems for the two engines is a different process.
Does your car have a check-engine light? If so, is it on? Have you had any techs examine the car?
When was the last time tune-up parts were replaced? Plugs, wires, etc?
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