1995 Nissan Truck Missing a Cylinder

Hey guys I was just wondering if you had any ideas for my truck. Just a little while ago my motor dropped a cylinder while driving. Every once and a while it would fire back up and run normal till I shut it off or went a longer distance. I have changed the rotor, cap, wire, plugs, ingnition coil pack. I have also taken the mechanics telescope to it and it sounds like all the injectors are clickingdo you have any idea's on what it is?Or where to buyy heavy duty injector cleaners?

thank you for your time I look forward to hearing from you in a while!


WILL