Temperature sensitive? Gee... maybe something that tells the ECU the
temperature of the motor?  Like the temp sensor II. Dunno about the
digifant system, but your symptoms certainly indicate that the ECU is
receiving bogus input.  You know, GIGO (garbage in, garbage out.) Were
it mine, I would determine which sensor tells the ECU the motor
temperature and replace it. "New" components have been known to fail.

Jim