Quote:
replaced the carb with a reman
Oops. "Remanufactured" carburetors are frequently very troublesome. You will likely have to pay some attention to it, and even that may not fix it. Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted
here for free download.
Quote:
adjusted the idle mixture according to the procedure in the green Haynes manual with the Diplomat on the cover.
Haynes manuals are useless (full of bad info) even when you're using the one that actually applies to the vehicle you're working on. Throw it away and get the books described in
this thread as quickly as you can. In the meantime, follow the adjustment methods linked from the carburetor post, and tune-up parts and technique suggestions in
this thread.
It's an interesting problem you've got. It sounds carburetor-related. If it were choke-related, it would go away much sooner than an hour. Have you checked to see if your manifold heat control valve ("heat riser") is working? Are you running a 180° or 195° coolant thermostat that's working correctly?
0° timing also has a way of creating flat spots. Try 5° BTDC and keep your ears open for ping. If none, try 7° BTDC.
Do you have any other symptoms? Rough idle, hard starting, anything like that?
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