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I have a Chrysler 251 in my Dodge M37. I'm using the original ETW1 carburetor. There seems to be a flat spot in carb. I'm trying to figure out if the vacuum power jets are clogged up, or if the carb is too small for the 251. Ideas? Thanks, Dale

Check the accelerator pump, the leather might be dried up, or possibly the brass ring that seals the vacuum chamber has cracked. Had both of these happen a couple of times.