Chevrolet: 94 Beretta missing, chevy beretta, second tank

Question
Roger,
We have a 94 Chevy Beretta (6 cyl, auto).  It has a slight miss.  My husband changed the plug wires and the ingnition coils but no change.  It seems to do it mostly at higher speeds (60 mph).  We thought too maybe it was bad gas.  It has been sitting for about a year without being driven.  He put gas additive in also.  Any ideas?
Thanks much.

Answer
Vee;
 Hi, well  if the car  has been sitting for 2 years you are lucky that you do not have any other problems with it, I would run some dry gas in the fuel tank and the miss should go away after a second tank of gas, after all the old fuel is gone and the engine is cleaned out. ok