Sticking throttle S1

[AlfaSpider]

Hi
I'm struggling with a sticking throttle and how to fix it. The cable is free and lubricated and returns ok with the engine off, however with it running its holding up taking a few seconds to return, I'm going to strip and clean the throttle body next see if this helps. Has anyone else come across this problem on the 2.8?

[AlfaSpider]

I tried fitting a stronger return spring which possibly helped to start with but now it's happening all the time. The pedal stays depressed and slowly comes back, as it's a cable I can't hook the pedal back with my foot to stop it revving. I'll have a go at cleaning it.

[AlfaSpider]

With the cable disconnected it feels free as does the throttle mechanism. It's odd because the pedal returns fine as soon as the engine stops. I'll try it again with the cable disconnected and engine running. I can only think the vacuum with the throttle almost closed is loading up the throttle pivot slightly.

[AlfaSpider]

I tried stripping and cleaning everything but it was still sticking until I removed the carpet and now it's fine. I should have tried that first perhaps! Thanks for all the advice.