I got a friend to put valve gasket covers on my marquis once he finished we cranked the car a lottttttt of smoke started coming from the tailpipe and from under the car so he went back in and resealed the covers because he said they weren't sealing then the starter went out so i brought a brand new starter he put that on and now the car is skipping so babdly and when i drove it everytime i hit the gas grayish smoke was coming out of the tailpipe and i just don't want him working on my car anymore so what suggestions do you have for me to fix this problem or maybe you can tell me exactly what the problem is?

Im not gonna defend the guy, but when an inexperienced person changes a valve gasket, oil drips everywhere . it gets on your exhaust manifold and will burn off causing your car to smoke like cheech and chong!. as for smoke coming out of your tailpipe. that could be something completely different., why did you think you needed to have your valve cover gasket replaced? were you burning oil. or was oil pouring out of the valve cover? did you check your oil dipstick? was it milky? or clumpy? was your car losing power? need a lil more info. starter could be he shorted it. or it was just time for it to go. starters just go sometimes. no warning. but like i said no info. smoke deffinately worse cause of oil on exaust manifold. it will burn off eventually. hopefully that will be the end of the probs. but check that oil. look for color like milk. power in car getting less and less. if thats the case. than blown head gasket. many other possibilities. does it leak coolant? maybe freeze plug popped out. lets just hope alot of spilled oil and big smiles. :)