1998 Chevie Lumina running very rough.

I have a 1998 Chevie Lumina and about a month ago I experienced an issue where the car after driving a mile and half from my house began to buck and stalled twice before I pulled off the road. I had a burning smell in the cab, possibly electrical. After looking under the hood, I didn't detect anything unusual and the odor that I smelled in the car, I didn't get while checking the engine, I looked under the vehicle and there were no apparent links and so I waited a few minutes and started the car and drove back home, during the journey, it was running rough all the way back to my house and since then, I have used the car, it starts fine, but runs very rough and does not have the power it had since this episode occurred recently, any suggestions, please let me know.