Hesitation at 46MPH.

I have posted serveral times on different forums and can't find an answer.

I have a 99' white trans am M6. When I'm driving and I go from 4->5 at 40, as soon as I get to 46MPH the car has a slight hesitation. It is almost as if it bogs down and then everything is normal again.

It isn't everytime I hit 46 MPH and i tried to slow down from 5th with no brake to see if it would cause anything at 46 but I felt nothing. I can feel it even when I'm in 4th gear (not as noticeable). When I'm at a full WOT I can't notice anything. What would be causing this? I am getting very annoyed at feeling it bog down at this speed. Also, If I slow down but don't stop, I won't get the hesitation. It is usually when I stop and then go. I don't really feel any problems with the clutch, and I don't get any slippage especially when I slam gears.

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*Question: this doesn't pertain to my problem, but I was wondering, if you're sitting inside your car what side of the engine would a 'right' part be located. Would the right side of the engine be located if you're sitting in the car or facing it from the engine bay?*

dude, i cant help you on your hesitation sorry, but the right side of the engine is the passenger side. like you are sitting in your car.

Is it only when in those particular gears, or does it always happen at a particular RPM?

I ask because the first sign of my fuel pump going out was that it would slightly bog after 2500 rpm.

is the ses light on? i had a similar problem that eventually got worse. the problem was one of the front O2 sensors was bad.