Hello,
Had a similar problem and browsed this forum looking for ideas. Took a chance and bought a new pedal from a scrappies round the corner. Problem solved so far!
The car also drives like it used to. I'd been blaming its crazy kangarooing on my shoddy driving skills.
Smashed the old pedal apart and found the guilty component:
I'd guess that it is a variable resistor. Damage to the resistive tracks is clearly visible. The resistor is sitting on top of the cat, who I have been trying to annoy today.