1986 Mercury Lynx mileage: 157,000. I have a problem that I have been trying to diagnose now for about two years. My Lynx will go for three or four months and run just fine, then out of the blue I will be driving along and it will sputter and stop running. I will let it sit for a few hours and it will start back up, run for a while, and quit again. This will go on for up to a month then it will return to running normal. I have had it in for diagnostic, tune-ups, carburetor rebuilt, thorough electrical inspection, all to no avail, I am at a loss. Right now, I am battling the on/off running syndrome. Any help would be appreciated.