Long day for me too. Clutch, motor/trans/pendulum mounts, oil change, rear main seal, trans flush on a mk7 pp gti. I'm sore today.
It took 6 hours for a tow truck to arrive?Running on the interstate about 80, started slowing down and when I hit about 70 it felt like it started engine braking a lot more, severe misfiring, and loss of power. I got off at the next exit and limped it to a post office parking lot. It nearly died trying to pull away from a stop sign. I keep spare coil packs with me and tried swapping those out. No go. It didn’t want to start back up and when it did it had a VERY strong fuel smell.
Failed spark plugs or bad injector would be my guess based on what you described and the fuel smell