Hi as u know I had probs with my brake lights it turns out it was the fuse not in properly.

Then when i checked again today they werent working so i mucked around with it and got them to work.

Now the car wont start and if it does it feels like its running on 2 cylinders

The car idles at 500rpm when it used to idle at 950. The car goes like a snail so im guessing i stuffed up a fuse

Which one would it be?

Which one controls engine or spark?

really pissed