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whyndman5, my M38A1 had the same problem. It would idle nice, but if you applied the throttle it would backfire, run rough, and had no power. The fix on my Jeep in the end was easy, so I hope this works on yours. I did the same things you did. I had the carburetor rebuilt, new points and...

Whyndman5, is this the type distributor that is in your M38A1 Jeep? Is your M38A1 still 24V?

Whyndman5, NDT is right. Check for crud between the needle and seat. Also install a fuel filter on the fuel line, this will keep your needle seat area clean. Also take a plastic mallet and tap the carburetor float bowl just to make sure the float isn't stuck. The filter in the picture fits the...