engine light come on and gas pedal juddering??

Hi,

I was wondering if anyone could help me as Earlier this evening when I was driving my Vauxhall astra 1.6 club, The gas pedal was juddering and the engine light came on. A friend said it sounds like an engine coil may have gone.

1) Is this a costly repair?
2) Will it be safe to drive it to a garage without further damage?
3) Does it take long to repair or is it a small job?