in theory, if it's the HEGO, resetting the eec should allow it to idle for a while before hitting the fueling limit. If it starts right away after a battery reset, could be wiring.
the very first thing I would do is crawl under the car and make sure both hegos are getting a good 12 volts. Then I would check the ground on the back of the engine (#19). Then check the Salt and Pepper connectors (#14 and #15).
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