A cable may be free when under no load but dry/stiff/sticking when under load. It needs replacing.Take the cable off the car and give it a full inspection.
FFS we are up to post #106. OP, you come on here asking for advice. I gave it to you in post #3. Refit the return spring and then fit a new cable like I said and stop questioning everyone or just stop asking. What more do you want us to say?
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