[maxwedge]

Welcome to AF . The cracked tank will cause a code for an emissions issue not a misfire, first I'd get my 359.00 ineffective repair money back. The list of possibilities for a random misfire code is lenghty at best, there is no quick answer. The truck should be checked for freeze frame info when the code was set and misfire counts checked, wire, coil, injector, plug are just some of the possibilites, but the dealer knows all this.