I have an 2006 Lincoln LS V8, with 62 K miles. It is babied and I have it serviced routinely. I noted the other day at a stoplight that the car seemed to have a miss, as I could feel it. The miss is somewhat irregular, meaning does not seem like a constant miss happening in a timely manner. On the highway if I give it a little gas such that it does not down shift, it is as if it lugs a little bit, almost seems as if the transmission is constantly shifting between gears up and down, but I note no excessive change in rpms indicative of shift change. The performance seems to be down a bit too. I get no codes at the dash. Thoughts???