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Marshmallow
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3,780 Posts
Sounds like the ECM may have taken a dump and lost the data. May have to visit the stealer to get it straightened out. I would first try disconnecting the battery cable for about half an hour to see if it might reset itself. Good luck and keep us posted.
 

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Marshmallow
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3,780 Posts
Thanks, the TPS can cause the surging or rough idle. There are a few threads on here that tell how to test the TPS. If that is the issue, get the OEM TPS from the dealer. A lot of times, the aftermarket sensors don't work right.
 
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