A rough idle and lack of power in a 1994 Mercury Tracer when hot could be caused by several issues. Common culprits include a failing ignition system (such as spark plugs or ignition coils), a clogged fuel filter, or a malfunctioning fuel pump. Additionally, a dirty or faulty mass air flow sensor (MAF) or a vacuum leak could disrupt the air-fuel mixture, leading to poor engine performance. It's advisable to run diagnostic tests to pinpoint the exact issue.
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