this truck is a water well pump hoist. only used when needed. only has about 80,000 miles on it. could injectors wear out that quick? ran several test today. dtc's 1211 1280 1282. also getting 0284 and cylinder rotational vel #8 - 7.9,#3 - 1.8, and sometimes #4 gives a slight reading. icp d/c 27.5