Apologies if that has been asked before; the search function shows up related but ultimately different issues. Here's what's going on:
As I pedal along, occasionally the left pedal will be reluctant to turn nicely so as to stay horizontal and nicely level with my foot.
At the very least it will make a protesting clicking sound. Occasionally it will just completely refuse to rotate, which awkwardly bounces my foot.
So I got off the bike to see what happens. If I try to manually turn just the pedal on the crank arm, it's not a constant resistance. Rather, it'll turn a bit, then offer a big resistance that I can violently push past, producing another crunchy click grind sound.
Would anybody know what's going on here? Time to replace the pedal? Or just some tender love and care?
EDIT: Details of bike. Commuter bike. Officially 10 years old but pretty much everything got overhauled in the last 5 years, with a complete cassette / bottom bracket replacement last year. 27 speed (3x9), not sure what derailleur style would be. The one that most normal commuter bikes have, I guess? Hub isn't geared.