2001 chevy impala transmission?

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hntraut

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2001 chevy impala transmission question. HELP. thanks?
my trani is not as smooth as it used to be. In fact it bucks a little bit. it does it just before it changes 1st, 2nd and 3rd gear. not all the time and not all gears in that order. it does not do it when I'm going fast. it does it when I'm going slow. it just started doing it all of the sudden. can a bad spark plugs cause this?

I have change/ flush the fuild and filter.
change cpv .
fuel filter.
motor mount.

but the sparks plugs cables are over 5 years old. I have no check engine light on. I have no codes.

what could cause this problem? thanks
 
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