ANSWERS: 4
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have your catlitic converter checked they melt down over time causing back presure
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replace distributor have found several times that hall effect sensor has gone bad and or shaft inside of distributor is worn and moving from side to side
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got to thinking if exhaust is smelling of raw fuel i would suspect that a part called a fuel spider inside of intake is bad but first pull off dist. cap and check shaft for side play and extreme build up of brown rusty substance
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Could be EGR, valve advance/clearance/sticking/bad return springs.. need more information.
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