Hi, i recently di a spark plug and lead change on a Ecotec v6 VS Calais, When i started the car after doing the change it seemed to start and idle ok, but since letting it go cold it won't start, The motor tries to fire but it then shudders and dies. I replaced lead by lead but i have a feeling i may have swapped two leads around. I believe the firing order is 1-6-5-4-3-2. Is this correct? and how do i check which cyclinder is 1,2,3...etc? If these are ok what could be the other causes of this problem?

Any help would be greatfully appreciated.

Ike

PS I did have a workshop manual for it but i can't seem to find it at the moment.