Well I only had one defective coil but it was a good price for all four so I replaced them all and drove the car for a day and then i had a really bad slip again so i had to put one of my old coils back on and now the car works fine so three out of four work. I really wish I could contact the company so maybe I could replace a bad coil but instead I have to return them all and buy another set somewhere. Hope this helps anyone replacing everything to make sure you salvage your old parts if they are still ok just in case as its all been running for hours
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