Why does my Jeep feel like it is going over rumble strips when driving? on 2005 Jeep Liberty

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Recently my Jeep has started to Shutter or feel like it is going over rumble stripes when I go a certain speed.
(2) Answers
(5) Comments
Any transmission work done lately? Any fluid added?
No nothing done recently. And it doesn't happen all the time. Worse going up hill.
Service eng. light on? Has it ever had a good tune up? 4 or 6 cyl?
No lights. NO work other then an oil change. 6 cylinder.
Not to a good tune up. Should probably schedule..
SOUNDS like an ignition coil(s) are breaking down or a bad plug boot(s) seek a good repair shop to check it out.
Will do thanks
maybe a tire is bad