Ok here is the problem, I have a 92 Rs 305 that runs perfect all the time except when I am sitting at idle after the car has been run a while the car is idleing at about 800 rpm when all of a sudden something makes the rpms drop or flicker a little. 25% of the time it does it 3 or 4 times then stalls. It will start up immediatly. It does not have any pattern for the flicker it might do or it might not and idle fine. Some days it will do it over and over to the point of making the car shake a little when it does it. I have been putting the car in nuetral and keeping the idle at about 1000 by touching the gas. It will still do it but you do not notice as much when the rpms are higher. I swappped out a new fuel filter and plan on doing plugs soon. It drives me nuts because traffic jams are a pain. The car shows no check engine light and shows no pattern except when it is warmed up it starts. She accellerates perfect and cruises perfect.

 

Any Ideas please!!!!!