When I first take the car out in the morning I notice it seems to really take off,almost like it's got a mind of it's own. The rpms go up and sometimes I feel the gas pedal go down by itself,and in city driving I've really got to lay on the brake at stops so I don't hit someone! Once I get driving on the highway for awhile it seems to subside...mechanic says might be a vacuum leak but there's no stalling. Any ideas?

 

i would check all your vacuum lines, could also be your IAS/AIS (automatic idle speed) Sensor. only things i can think of

 

Didn't do it this afternoon when I started it,maybe because it was warm out...maybe it being cold has something to do with it also.

 

i have never heard of this before but it may be your TPS sensor (THROTTLE POSITION SENSOR) thats all i can think of

 

See if you have a dirty throttle body cable, or butterfly. This happened on one of my old mustangs.