93 taurus slight jolting

93 taurus 3.8L 118,000 automatic. There has been recently a very slight jolting while idle and it is becoming more frequent.
Any ideas what this could be?

Thanks

First thing I would look at is plugs and plug wires if they havent been changed for some time.....maybe a bottle of injector cleaner ...for a couple of simple possibilities....g'luck

I would try adjusting your timing on it i have had the same problem with my nova and my sisters taurus.