Vehicle was missing on #1 & #6 cylinders. Driver in Ecm was determined to be at fault. Replaced ecm, tried to program, it won't accept the programming.I was then given codes P0603, P1260, B2139, U1147 & B1845. All of which were not there prior to replacing ecm. Codes that were there prior to replacing ecm were P0351, P0352, B1202, B1323, B1318, B1410, P1137, P1157, P1408, P1131 &P1151.
Through troubleshooting it was determined that the instrument cluster needs to be replaced but I am not so sure of that since there wasn't a problem with it before. Also, doing a check of the IC it seems to be working fine, all guages doing a sweep and all lights working as well. Please help. Thank you in advance.