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If your coil is mounted on the engine I recommend (getting a known good coil) moving it to the firewall or inner fender.
A overheated or bad coil always seems to behave the way you described.
Short answer-Yes! Lean burn TQ's have a throttle position sensor, throttle stop sensor, etc. Some even have an altitude compensator.
Believe it or not they weren't jetted overly lean--remember with running EGR the engine draws back in more exhaust gasses to "re-burn" in the combustion chamber...
I love my Thermo Quads! When set up and functioning properly they are one of the best street carburetors IMHO!
Similar experience for me when I rebuilt this TQ for my Cordoba-- plunger check valve fell off into the bowl after a few drives and the plastic w/rubber plunger had too much play in the...
The '67 Plymouth b-bodies are one of my favorites! I really like the GTX touches you've added here! Center console, buckets and the flip top fuel cap are timeless! :thumbsup: