hello all, I have an old K10 with a 292 inline-6 that has been dead reliable every time I start it- until last weekend. I drove it up to the mountains (6500ft) and back down to the town I live in (5300ft). The truck was running for about two hours non stop. On the very last leg of the trip, I was coasting down hill in 4th gear, and noticed the exhaust “burbles” getting a little louder, I pressed in the clutch, and a huge explosion sounded, later found out to be my muffler exploding. After this, the truck stumbled pretty heavily, and would die out if I touched the gas pedal. Spark finally gave out and died and I restarted it, but then the power would get weaker and weaker, as I stumbled down the road, then finally died for good and wouldn’t restart, battery was holding good voltage and turning her over just fine. On the side of the road, I replaced the points, gapped to .018” replaced the rotor, cap, plugs, wires and coil all to no avail. Towed her home and replaced the starter, starter solenoid, and tried three more coils, and replaced the all wiring from the ignition to the starter and battery etc. truck just isn’t putting spark to the coil, not even if I jump power straight the coil from the battery. I’m at my wits end and need some help getting this old girl running again!!