Thats what im here for, help you guys out, i dont own a trophy, but do have access to info, i work in our tech department along side 2 rte's one of which was crowned no 1 in the country! so hopefully one way or another il be able to help you guys out!
they may show an oxygen sensor fault when the temp sensor fails, as it over fuels, and the oxygen sensor works over time and thinks its at fault, but its the temp sensor causing the problem if you see what i mean!
yeah it will run rough, probably over fuel as it see's in correct water temp, and trys to componsate for cold conditions, whens its actually warm, techs at reno dealers arnt all bad you know!