i have a 2003 V6. it runs great to have 125,000 miles on it, but just recently when i am driving and the RPMs get up to about 2500 it has a miss or jerking feeling it it. i have changed the plugs and plug wires and its still there. not as bad as it was, but there none the less. and it seems like as long as the RPMs are under 2500 its drives great and if they are over its fine.. anybody got any suggestions?