Truck was running rough on idle and slagging.

Truck was running rough on idle and slagging driving. I put new plugs in, cleansed the mass air flow sensor, and also a new engine coil. The running of the engine improved so I also sprayed throttle body cleaner in repeatedly for a while. Sounded better and ran it. Then just put a little more in then it stalled out. Won't start even after sitting a day. Don't know where to start? Now it seems the plugs arent getn any fire. Put the old coil on to check & nothing.