Smell of burning plastic when driving

I have a Vauxhall corsa d, and I drove to Alton towers in it about 5 days ago. After coming back from Alton towers the day after the car felt very sluggish and started to smell abit of this burning plastic type smell. The cause of the sluggishness was a coil pack. I had the coil pack changed and the car drives normal now however I still have that burning smell of plastic can you help me

Many thanks