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94' 960 (180K mi.)cranks & runs good cold, however once warmed up (only a few minutes)the engine revs up to 2000-2500 rpm and stays there. However, the engine runs smooth. The engine can be reved up (still smooth) but idles back to 2000-2500. When it's been running at this level for a few minutes or longer and I turn the ignition off, it can't be restarted hot. The starter/engine turns but will not crank until it's cooled down completely. The check engine light is on and I don't know anything about checking codes. First time Volvo owner needs help!!
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