Help please,

My car cut out the other day on a gentle drive home, called the AA (Damn, there lies another story!) and could do nothing but recover the car.

On investigation i had no spark and no pulse to the injectors.

I have since replaced the heatsinked module on the inner wing next to the battery and now have a spark, but only 1 big one at first crank then nothing!

Any suggestions will be geatly accepted and hope this is not too teminal.

Cheers in advance
G