I replaced both of my coil packs about two years ago. I checked the spark out of the packs and one was bad. So, I spent a wad to replace them both. I would have done it myself, but I didn't have some of the tools to do the job. I bit the bullet. My question to all of your here is, "Where are the jet adjustments"? I can't find any information any where on the World Wide Web. It must be a John Deere Secret. LOL