Bad misfire on VS ecotec

[Aussies2011]

I had a very bad misfire on my car 10 days ago.
It misfire on starting and it takes a couple of kilometres for the misfire to go away.

Rather than looking for the problem
I bought a new set of spark plugs and a new set of leads.

It worked for a week
And today it was back... just as bad as ever.

Anyone knows what I should be checking?

[petergl67]

Hi mate double check the spark plugs again and see if they are good cause I had the same prob. I started getting a misfire then mechanic changed spark and leads a week later misfire again. I took it to a mechanic that works on my kind of car and I had to change all the plugs cause the mechanic over tightened all of them and the snapped. Hopefully it's something like that cause it's a quick cheap fix. If not maybe coil pack but I wouldn't think so

[The Dok]

Coil pack or (less likely) moisture on the module (the plate the coil pack mounts on), if the misfire tends to clear after the engine warms it usually points toward a moisture issue but in my experience it is most likely a faulty coil pack segment!

[VS_Pete_1]

^^^
yep as above.
Just replaced DFI module,coil packs,leads on girlfriend`s car (same as mine) running like a new car.
All the parts were old and faulty.

[Aussies2011]

Just saw a second hand coil pack on Ebay for $95
What's the price of a brand new one?

[VS_Pete_1]

About $60 each I think.