It seems as though my engine does just not idle right. I just had a fresh rebuild about 1500 miles ago. I put solid motor mounts on (don't know if this may be part of the reason), but i just feel it in the car, and I can hear the engine miss, and see the track move. Is this normal for a 3.8L? It seems to be the worst after I have gotten on it some. Also, when i push the brake in and put the shifter in "D" it likes to almost stall. Like it can't hold an idle very good. And the last symptom is when I rev it up in nuetral or park, it takes a long while for the engine rpm and tach to fall back down (well longer than normal). Any ideas?