Good day

I really need advice about 3 months ago I had my head Cylinder gasket replaced as it was blown. Before it was replaced never had any starting issues except the misfire cause of blown gasket. Now since I got my car back I'm having hard starting problems and back fire through the exhaust.


Please help what could the problem be I replaced spark plugs made no difference.

 

Sounds like it might be out of time. I would check that.