92 Saturn SL2 SES light comes on while driving, SES light goes off when throttle closed and slowing down or idle.

SOURCE: 99 saturn sl2 has lost reverse

Last time this happened to me Saturn replaced valve body in tranny, this can be easily done at home if you are handy

SOURCE: '98 SL2 Saturn Traction Control

Traction control helps limit tire slip in acceleration on slippery surfaces. In the past you had to feather the gas pedal to prevent the drive wheels from spinning wildly on slippery pavement. Many of today's vehicles employ electronic controls to limit power delivery for the driver, eliminating wheel slip and helping the driver accelerate under control. Don't turn it off.

SOURCE: 1993 Saturn SL2 will not shift into highway gear

Saturn says and I quote

there transmission fluid is not to be changed after the first change at 6000 miles.

Now I say it should be changed at every 30000 miles. If changing out the fluid doesn't work then you need to go to a transmission repair shop.

SOURCE: 2003 Saturn L300 indicator lights stay on: ABS, SES...etc

first problem, went to autozone. the guy that looked at your car was making pizzas last week. they pull codes and sell you every part you will buy. take the car to the saturn dealer and replace the bcm.

SOURCE: myservice engine light came today rogh in idle at light rpms seem a little high this is a 98 saturn sl2 I think engine is a 1.9

the check engine light means that a code has been set. the code will reference a faulty system that must be diagnosed and repaired. sorry for the vagueness, but there are e gads of codes that can cause the rough idling

most aftermarket parts places will scan the car for free. this will give you an idea of where to start.