[vn60]

Just got my 1st Mustang only has 43000 miles and is in oustanding shape. Garage kept 1 owner. I notice at times when the car goes through the gears (automatic transmission) has a tendency to buck especially when I accelerate rapidly, or gun it. Other times runs through the gears smoothly. Just filled it with 93 octane to see if it might make a difference. Other than that car rides like a dream. Thanks in advance for any help. Vic

[stlwagon]

Welcome... Let's see what we can find in here.

[ahhahhchue]

did you check your throttle position sensor?

[tex117]

Originally Posted by vn60

Just got my 1st Mustang only has 43000 miles and is in oustanding shape. Garage kept 1 owner. I notice at times when the car goes through the gears (automatic transmission) has a tendency to buck especially when I accelerate rapidly, or gun it. Other times runs through the gears smoothly. Just filled it with 93 octane to see if it might make a difference. Other than that car rides like a dream. Thanks in advance for any help. Vic

elaborate on what you mean by it "bucks"?

[Oldboots]

The 93 octane will only retard detonation which is helpful for high compression engines. To run 93 in a 4.0 is a waste of GREEN. It will not improve how your car runs.