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Originally Posted by yetterben
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check the vaccum hose to the fpr for leaks..beyond that..there are way too many things that could be making it that way...also..take a look at the doughnut gaskets around the spark plu hols in the valve cover..if oil gets into the cylinder you will turn them black..and depending on how much you will see smoke out the exhaust..but i doubt it would do it on all 4 cylinders.