Yeah, 41 and 91 mean that the system is lean. 42 and 92 mean that the system is rich.
Code 31 means that the EVP sensor signal voltage is below the minimum. Disconnecting it and jumping those two wires will send the VREF back to the ECM as the sensor signal voltage, which would be too high, and it will trip a code 35. If that happens, then you know the system is working, and the fault has to be in the sensor.
Yes, 30 minutes should be long enough, but to be safe, do it again, but this time turn on the headlight switch after the battery is disconnected. This will ensure that the capacitors are completely drained, resetting the ECM.
Driving it with the ECM thinking the system is lean will cause it to run rich. Running rich, across the country, will kill your wallet in the cost of gas, plus you run the high risk of clogging any cats that you might have.
Take care,
~Chris
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