I had my doubts because I had never heard of the company that made it. I have a Mustang 97 3.8 V6 5 speed that has been idling for 200,000 miles. I added these and Walker spark plug wires. I even ordered double platinum spark plugs as recommended. Now the spark plug wires and the coil arrived first. I decided to start with a head start as the spark plugs weren't delivered until the next day. To my surprise, it now idles very smoothly with just one coil and new wires. I look forward to adding new spark plugs to see what happens! I recommend high end spark plug wires like Wanderer when connecting them to your vehicle. I have a new Mustang and it idles just as nice as my new one.
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