That is a tension spring for the throttle. I maintaines the throttle lever in position. This would not likely cause surging, just either too hard to move throttle or lever would not stay in position you put it. I would first look at carburetor. Mainly the load/high speed circuit. If you reach in and physically hold the throttle in one position does it start to falter? if it does look into rebuild of carb and check fuel flow from tank. If it does not run out of power when holding it in position look into setting governer. Please take the time to do a followup as to what you find.....
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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