One problem related to crankshaft position sensor has been reported for the 1999 Cadillac Deville. The most recently reported issues are listed below.
Vehicle stalls at between 25 and 32 mph after coasting or braking gently from 50 plus mph. Took to dealer on 09/28/00 who said it was dirty fuel injection system, system cleaned. Dealer wanted owner to drive the car for 500 miles to see if the prblem was fixed. At 300 miles,owner's son and wife both had condition occure 10/01 and 10/02/00 during a turn which did not result in any problem but the potential for an accident is high. Owner was able to recereate the problem 5 times in one day (10/03/00) sent to dealer on 10/04/00 who indicated that there was a service bulletin to replace a crank shaft sensor. This was done on 10/04/00. Problem is back on 10/06/00 same condition. Dealer informed awaiting response to the stalling problem.