Dirtybird, I don't care about the shipping cost, right now I have a $3000 airplane that is sitting gathering dust because the engine won't run. I'd rather send it to somebody who knows what they are doing and after my phone call with Horizon I don't feel they are the best choice. I will call Ralph and see what he says. Would one bad coil cause no spark in BOTH sides? I find it unlikely that both coils or both plugs would die simultaniously.