[mullsie]

Hi everyone,
I have a 2010 i30cw with 130k on it which started to misfire badly 2 minutes into a 5 minute drive.

I checked with an OBDII reader and there were random misfires on all cylinders but  most were on cylinder 3.

I had a mobile mechanic take a look who replaced the plugs, leads and coils - but the car is still misfiring. His guess is it might be a small hole in the head gasket because the car is getting hot so fast.

I tried some Rislone head gasket fix and it didn't seem to help but when I connected the OBDII reader again 99% of misfires are on cylinder 2 now with none on cylinder 3 .

This is a old car and its getting expensive. Any ideas on this?
thanks for your answers

[mullsie]

Resolved - One of the new spark plug leads was faulty

[CraigB]

Thank for the update, I'm glad you solved it

[Shambles]

 

Strange, though, that it was misfiring before your mech replaced the leads and still misfired after 

That suggests it wasn't the leads at all, but maybe how the leads were connecting... 

Glad it's sorted.