Ok so I have an 01 s10 4door with a 4.3. I've been having an issue with a cylinder 6 misfire. It only presents itself with anything more than a gradual acceleration to cruising speed (55-60) or when pulling a trailer. I've changed spark plugs, wires, distributor cap and rotor, fuel pressure regulator, o2 sensors, done compression test, injector balance test, and checked for vacuum leaks and still NOTHING. I can't get this figured out and don't know where else to go with it. Has anyone else had or seen this problem before and if so what else can I do?!?!