First off - thank you to everyone for their ideas.
Turns out it wasn't O2 sensor, or vacuum, or even ECM. The car set a
service engine code yesterday, so I read it, and the answer was....
Code 22 is Throttle Position Sensor. Turns out the connector wasn't
fully seated into the TPS unit and a month after my recent plenum
pull, it apparently had moved just enough to cause an intermittent
Marc '91 #1334
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