Can relate, David.
Got my Golf home after class, got in the Jetta to go to Autozone for spark plugs, wouldn’t crank. Sounded like the starter solenoid was closing, but the starter wouldn’t crank. Hoping it’s just ignition switch, which is a known weak spot on the Mk3 Jetta.
So I drove the Golf, intermittently missing all the way there. Got the plugs, got home. Changed two plugs no problem, third plug wire tore at the boot and the wire popped out. Crap. Haven’t done the second two yet. Also tore the boot on the wire that goes to the coil. So, good. I can’t do anything right.
Fouled plugs for your time.