Was mowing and the accelerator pedal disengaged and now just flops back and forth. LT1050.

slack belt or electronic clutch issue.

https://www.google.com/search?q=Cub+Cadet+LT1050+PTO

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Switch that activates blades went bad or a wire came off.

Check the return spring on pedal, may be worn out.

I sounds like there's significant resistance to the engine turning over. I experienced this when the electric PTO/clutch seized - and the mower was trying to turn over the engine AND the mower blades because the PTO wasn't disengaging. Try taking the mower belt off the PTO and see how the engine turns over. If it's still slow, the problem is in the engine. If it spins normally, replace the PTO clutch. BTW - when my clutch seized, it also burned out the PTO switch. The switch is pretty inexpensive, so if you're replacing the PTO/clutch (I found one online for about $175.00 - MUCH more expensive at the dealership) - you should probably replace the switch as well.

Check if the return spring fell off.

check the pedal switch

seat safty switch

Hi try adjusting the electric clutch you have to adjust it by tightening the three nuts on the outer edge and slide a 10 thou feeler guage through the three sides.
hope this helps.
Mark.

It's probably not the cable, but the idler arm on the deck that the pulley that tightens up the belt is not moving back and forth freely, probably from rust. Spray penatrating oil on the pivot point while working it back and forth until it frees up. If still having problems, let me know. Dwain

Check the ear that connects to the rod that goes through the firewall to the clutch master cyl. likely it's broken.