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Q: smells of gas and no visible fuel leak, idle ocilates 4-500 rpm, stalls occasion on 1990 Volvo 740

could this be vac leaks or is it map,o2,sensor related? fuel pressure? also will occasionally buck while driving at interstate spd. there is no check engine light on also the speedo has become erratic and the anti lock light is coming on after hitting a bump and now stays on longer/more often
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