Join Date: Mar 2009
Location: Interior Alaska
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How long has it sat? With it running rough, the first thing I suspect is fuel, then spark as it does run. Have you replaced the fuel filter? How do the plugs look? What is the timing set at? What engine? Points distributor or Gold Box? What are your compression values?
First thing first, it starts, so you have spark albeit rough. Could be a bad wire or faulty plug. If you have a fresh fuel filter installed, and it's not been sitting for a long time (more than 6 months), you can almost rule out carb buildup and go towards spark issues. Check your timing and dwell (if points system) as well as plug condition. Compression will let you know if you have a bad one or not.
Post back up with what you find. Check other forums as well, binderplanet.com, ihonlynorth.com, JustIH & binderbulletin.org have tons of information and may help you on your quest to get a good running rig again.