I'm going to look at a 97 Expedition with a 5.4 with 170k miles. Besides the spark plug and exhaust manifold issues, is there anything else I should be looking for with this year of engine? I have pretty good experience with the Triton engine. I have an 03 Super Duty with the 6.8. Also, any other information about the performance, longevity, and specifications of this engine would be appreciated. Thanks!