Do the 08s have the same head/spark plug issues as previous 3v 4.6 engines? (I also have an 04 F-150 5.4 3v with the two-piece plug issue.) Also, think I read somewhere that the shifter in the 08 has been upgraded from previous models. Is this true? Actually I'm really impressed with the way the stang shifts, and that's coming from an 06 6 spd Miata known for its great "snick-snick" shifts. With only 150 miles on the clock so far, haven't done any hard shifts yet. The test is always the 2-3 shift...