10 hours a quarter mile at a time can be A LOT of miles! You can't trust most sellers these days and even the honest ones sell cars with unknown mechanical woes. Race hemis are not Toyota 4 bangers, they USUALLY require frequent maintainance and a knowledgable mechanic to deal with it. You likely have a wounded warrior on your hands and that will likely go really south REALLY fast without finding the issue, not something a first time Mopar owner will have a good time with. I'd reccomend getting someone in the know to help you out. If you post the cars location we can likely send you in the right direction. If it's in Seattle you might contact www.rocketresto.com and ask for Mike, he knows his stuff