I recently replaced all the spark plugs and coils on my 2003 Lincoln Town Car. It was running beautifully before I found out it had a cracked intake manifold and was leaking antifreeze. I took it to the shop, and they installed a new intake manifold and did the valve cover gaskets while they were down there because there had been oil on the old spark plugs. Now the car is idling rougher than it was and doesn't have the smooth acceleration it had before I took it in. It even stays running for a second or two after I take out the key. Any thoughts on what it could be?
What they obviously screwed up the job take it hand tag off is a relatively big job and there's so many things that could have broken on an old car plastic parts sensors vacuum lines make your head spin take it back and make a fix it right
