Misfire

Hello, "after head gasket" -- what determined that there's a head gasket failure? Who performed repairs? Did you perform compression testing of the engine? Have you verified cylinder integrity? Misfires are one thing, bogging down is possibly another. I would recommend whoever did the repairs recheck the work, including base engine compression testing, leak down test, checking for proper timing. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops