i have a 1997 mustang with 3.8 V6. i have a strange noise and not sure what it is. was wondering if any body has had this before. from a dead stop start driving going through the gears (automatic) til i get to 40 to 45 it makes a stuttering sound and shakes the car or vibrate. if i decelerate. from 65 to 40 45. the same thing. even if I'm just cruising sometimes it does it then to. but mostly around 40 to 45. i thought maybe a fuel problem (filter, injector) But not sure any thoughts? thanks in advance.:?: