Why is my grand marquis have a hesitation or a jerking motion at 30-40 mph?

Why is my grand marquis have a hesitation or a jerking motion at 30-40 mph? it only has this jerking feeling when im cruising around 30-40 and accelerate? and when im going 55-60 and i let off and accelerate again. is the trans slipping? can trans stop slip fluid help?Why is my grand marquis have a hesitation or a jerking motion at 30-40 mph?this may be an overdrive problem, if this is happening at the point it normally shifts into overdrive, and/or high gear. Let Aamco check it for you, BEFORE you start pouring stuff into it!!! Some will diagnose it for free !

mymathlab login

spongebob games online