1992 Mercury Grand Marquis electrical system problems

I have not expierenced a failure to my car (except that the drive train had to be replaced before 50,000 miles). I am sending this info. Because I discovered that there had been a recall(NHTSA campaign #99v124000). I want to find a dealer in or near my area to replace and install a "new speed control deactivation switch and connector shell) my car was bought from a used car auto sales place.,not an actual mercury dealer. Can you please advise me on how to proceed in having this defect to my car repaired?

My 1992 grand marquis was taken in for what was a minor miss in the engine. The machanic said the computer showed a code 214. He replaced the coolant temperature sensor/switch (for computer) per the code in the car's computer. The car was returned to me and I drove it to work, about five minutes away from the repair shop. About 4 hours later I got in the car to drive home and it started missing real bad, like it was not getting enough gas and about to shut off.