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PeteKz's comments about manifold vacuum would apply to a CIS basic system (early SCs), but Damon88 has a 1983 engine with the Lambda CIS system. That uses the Lambda controller, throttle switches and frequency valve to enrich the mixture for acceleration and WOT. Have you confirmed those components are working? Even with the oxygen sensor unplugged, the system will operate in "open loop" mode.
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1978 SC - original owner
1983 SC - D stock "rescue" track car
DECEASED 2015 Cayenne Diesel (rear ended by distracted driver)
2017 Macan (happy wife...)
2016 Cayenne Turbo - tow vehicle and daily drive
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