Carb help...

Motorcraft 2100 "121" carb on my 2.3L, it will NOT idle down, rev it to any RPM over idle & it stays there for at least a minute or so then ever so slowly idles back down. There is 2 return springs on it & linkage is NOT bound anywhere. Just put in new needle/seat, diaphragm pump assy. & new base gasket, didnt help. I am carburetor ignorant so any help greatly appreciated.

I'd start with the basics, gaskets correct for model?, right side up? Float level & Drop correct? Vacuum leaks? linkage hooked up right? Gotta be something simple, I've caught myself many times making a simple error...
Good Luck!

BTW, Mike's Carburetor has a series of 5 short videos on UTube showing a complete rebuild of a 2100 with hints. Well worth a look:

http://www.youtube.com/watch?v=h4J4QhNDj6Y

Thanks for the info. Ill check the videos out.

Jerry,did you happen to find any intakes? also need a mustang 2.14 transmission

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Originally Posted by Dirtman29

Motorcraft 2100 "121" carb on my 2.3L, it will NOT idle down, rev it to any RPM over idle & it stays there for at least a minute or so then ever so slowly idles back down. There is 2 return springs on it & linkage is NOT bound anywhere. Just put in new needle/seat, diaphragm pump assy. & new base gasket, didnt help. I am carburetor ignorant so any help greatly appreciated.

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If you run a distributor, check the springs on the advance weights. Check the idle with a timing light.

Its a TFI dist. No weights in it that im aware of.