Hi everyone i have a punto sporting 1.2 16v.

It idles bad and when i take the HT leads of cylinder 2 and 3 the engine does not change but does if i take of 1 and 4?

Things i have done.

• New HT leads
• New coil
• Checked plugs 1 and 4 are fine 2 and 3 are black not oil more like carbon dust?
• Injectors are fine
• ECU is fine

• Throttle body cleaned

vapor from exhaust so thinking head gasket but no oil is burning?
When i put my foot down after 2000rpm seems to clear up but still loss of power cant do a compression test as have no way to do it.

Can anyone help me here?
Thanks in advance

I was going to suggest a comp. test because it sounds like the head gasket has blown between the 2 cylinders.