Awhile back, i switched to a set of Bosch plus-4 Spark Plugs cause i heard a few times they give better fuel economy and performance. But ever since i did, about every 20,000 miles I get at least one ignition wire blowing out thru the sidewall of the boot on the spark plug end. This time it has occured on the #6 boot/plug .
Do these Bosch plus-4's have a higher resistance ? Maybe im better off going back to what the car came with ?