Hello i have a 96 buick regal custom it drove great the first month i had it now it feels like its cutting out,driving rough im not sure what to call it chugging but only when its between 40/45 miles per hour wether i drive on an incline or straight away.Im somewhat mechanically inclined,Brake jobs, replacement of almost any exterior engine part,By no means a mechanic but do like to fix my own vehicle if possible.I need help with this issue!Thank you