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what car (year and model) is this? also i think what would be a good idea when you have questionable performance is to get a solid performance figure. ie. 0-60 time would be a good start.
i doubt having a tiny exhaust leak would cause the problems you are describing. besides, exhaust leaks are almost always audible as a putt-putt-putt sound.
try some basic stuff like cleaning out your throttle body as well as double checking for vacuum leaks anywhere.
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Kenric Tam 1990 Volvo 740 base sedan (B230F) My Volvo 'Project'
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