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have 99 with cyl 8 missfire, no eng. lamp, contribution test indicates cyl. 8, cyl 8 injector, harness, and valve cover gasket already replaced 8k ago, comp. test only 150 psi, hen oil added to cyl, 8 compr. returns to over 400 psi, any ideas, was going to put injector, i think injector washing down cyl. will comp. return with new injector
 
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