I was having the same problem it was very intermittant my car would stall, miss & run horrible it would also flash (sys) on the dash while the security light flashed then it would not start for a few minutes I became affraid to drive this car because it may let me sit. It happened one day by luck while I was at the Cadillac dealer and all the mechanics were leaving for the day. The boys were very excited about seeing a ZR1 and they all wanted to work on it. One thing that they all agreed on was the VATS system was the issue they bypassed it with a resistor under the dash somehow the cost was $150.
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