This will be a little lengthy, but here goes. We have a Husqvarna YTH2148 that suddenly started smoking and would start but run very roughly. The last time it moved under its own power it would move very slowly and die when you engaged the blades. I have replaced the starter, solenoid, plugs, in-line fuse from the switch, filters, and battery. It will not start now even if the battery is bypassed and started by sparking the starter. It sounds like it’s going to start, but just won’t. I tried squirting some gas into the carburetor, but it backfires and still won’t start. The ignition switch checks out fine with a voltage meter. I thought last year it might be a coil since I disconnected each plug and it started with one cylinder, but not the other. Now even that doesn’t work. This is all new stuff to me. Can one of you experts help me? BTW, I have no way to get it to a shop and can’t afford one anyway. I’m at a complete loss as what else to try.