You could go back to the basics; check compression, attach a vacuum gauge, etc. to get a measure of overall health of the engine. Once my '67 started running erratically. I searched all over the place, checking everything. Turned out to be a worn Quadrajet throttle shaft bore.
Regards, George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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