TPS
IF THE IMAGE IS TOO SMALL, click it.
During the trip to FL, the idle got progressively higher, until each time I turned the engine off. That strongly suggested that the EEC was storing a higher ratch value during the drive, which was eventually confirmed by a CEL with a DTC for the TPS being out-of-range. When I got home, I tested it and found it to be VERY intermittent, so I ordered a new one (which is still made by CTS), tested it (it passed), and installed it.
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