SOURCE: 93 Cadillac 3 codes E48 E75 and E98 How to fix?
timing should help the idle issue. and the vss probly needs to be replaced.check the egr diaphram its gold and is underneeth the air breather. push up on the bottom of diamphram it should move without alot of efort. if not replace it
P0031....HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0052....HO2S Heater Control Circuit High (Bank 2 Sensor 1)
code 91 does not exist
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