Had multiple cylinders misfiring changed plugs (bosch 2x) and problem persisted. Bought 12 bosch wires part# 09848 from autohausaz and issue was resolved, however i noticed that on the box the wires came in it clearly states that "this product is for use on american and japanese vehicles only” so far everything is working fine. Anyone have any thoughts in this? Also i accidentally filled up my gas tank this morning with 87 gas (I been driving the wifes car and hers uses 87) ...is this a cause for concern? So far the car is driving perfectly