My car I turned it off at a gas station went to turn it on it wouldn't start , finally got it started it was in park and was jumpy making a horriable noise. Then I started smelling something burning . Check engine light is on and also it's jumpy in idle it's having a hard time inclining speed. I replaced the housing unit and it fixed it but now the problem is back with a burning smell is this possiably a coil ?

 

what "housing unit"? Check the codes?