What did u ever find wrong with your truck my truck doing the same thingWell I am having issues with my 97 C7500 GMC Topkick 6.0 ltr. It idles fine after warm up, I do smell alot of fuel upon ignition and backfiring or missing. It idles alright after that. When gearing down to a stop it backfires, not loud. It does stall out around corners at times. Sometimes I belive it chokes itself out because you can smell the fuel. I've had the distributor replaced, coil, wires, etc. Any ideas?