One problem related to car throttle sticking has been reported for the 2003 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mercury Grand Marquis based on all problems reported for the 2003 Grand Marquis.
2003 Grand Marquis developed problems with the alternator, the throttle sticking open and alignment problems. There was also a rattle noise coming from the engine and the digital readout on the dash was not reading properly.