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IIRC there was a known problem with converter lockup and consequent "shudder" as it can happen at too low a RPM. 4th gear is a pretty high overdrive so even with the 4.10 rear gears it's easy to really load up the engine.
I had a no-start issue which was (I hope and pray) permanently resolved when I changed plug wires at the end of the year. (Bad coil wire, going open intermittently, but I haven't driven the vehicle enough since then to know for sure.) I'm hoping there was some sort of non-obvious misfire that was hurting economy but I'm not holding my breath.
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