Hi all I've recently had my head gasket replaced as it was leaking, for an Athena 1.4mm one, but ever since then the car has mis fired on boost. More so around 0.1 - 0.3 bar but can happen at any time. I've changed the leads, plugs, rotor arm and cap but it still happens as I was originally told it was an electrical issue. I've noticed this morning that I've got quite a large oil leak down the drivers side of the engine. It's all down the side of the block and over the sump, looks like from the head gasket area. Could this be the reason why the car is mis firing? If not, what else can I check? The car was running fine before the HG was replaced. No error codes being thrown either. Cheers for any help