check engine light and rough idle/takeoff

[Cleffordesigns@aol.com]

Wondering what's the problem and if they are related.  For the last year+ my 
96 GLX seems to have a hesitation when starting, taking off (from start and 
at lights) and sputters when the air conditioner is running.  Just not 
running as smooth as it used to.  Now every once in a while when I rev the 
car into 5000 range the check engine light comes on.  It stays on for about 
4-7 days and then goes off.  This probably happened 4-6 times over the past 
year.

What's the dilio?  I definitely need to change plugs and wires which could be 
contributing to rough start/run but what about the check engine light.  And 
why does it only come on when the rpms reach 5000 +/-.

Thanks.

mike