My son works 7 days a week. I'm retired, so I'm trying to help him. When he bought his '88 Silverado K1500, 5.7L, 350 trans 6 mos ago, it wasn't running very good. It still runs, but not good and has a heavy fuel odor w/ black smoke. His cel code reads "PROM is not seated. He found one pin bent on the PROM, straightened and reinstalled it, but still gets same "PROM is not seated" mssg. His mechanic friend says the PROM/chip is probably toast. His ECM is an 88999146 and he and I have been looking online for a chip/module/PROM labeled with the same AMUR 0055 that came out of the ECM, without success. Several websites show the numbers 16060836 and 16060837 as a possible replacement, but nothing seems definite. The truck doesn't seem to be running in the "limp" mode which (from what I read) is a calpak module. Any suggestions to a 71 year old computer-illiterate helper would be appreciated.