My accelerator pedal has always been pretty stiff and the shifting never great in my 1995 E300D. I've cleaned, lubed and adjusted everything and it is much better than when I first got it but still kind of rugged. While browsing eBay to see what other E300Ds are out there I noticed a spring on the throttle setup in one of the pictures (below). I am missing this spring, perhaps it might help further refine my driving experience? Anyone know where I could order it from?

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1995 Mercedes E300 Diesel