My 02 Express, 4.3 Vortec, has an issue of mis-firing under heavey load or step hills. New Wires, plugs, Cap, Coil Etc. The Computer Scan shows DTC P1381 Misfire Detected - No Communication with Brake Control Module Would the Brake Control Module actually cause the vehical to mis-fire and hesitate and go crazy? It flashes the check engine light while clinbing hills. Sometime works not to bad. When you leave in the morning, It barley crawls up hill kicking and bucking.
Thanks