My 82 was doing this. Disconnected battery. Disconnected ECU connectors. Cleaned connections with vinegar and baking soda, then rinsed with water. Then cleaned with electric cleaner. Let dry over night with a lamp projected on the connectors to make sure they were dry. Applied dielectric grease to the connector. Then she ran past 4krpms, still stuttered a little around 4500 rpms but would go through it. Pulled spark plugs regapped from 1.0mm to 0.98mm. Now it runs right through pulls hard at 10psi till 5500rpm
