I assume you are letting off on the gas when pushing in the clutch? Is the spring rubbing against a arm of the linkage? Might consider relocating the bottom end of the accelerator spring at the oil pan slightly towards the rear?

Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.