Question about 2003 Mercury Grand Marquis
It's hard to say if this is something more dire than this, but have your spark plugs and wires checked out.
If a cylinder is not igniting properly when you accelerate, it would definitely cause this problem.
I had a car where it would 'jump' when I was trying to accelerate past 30-40mph and switching the wires fixed it right up. Hope this helps!
Posted on Mar 13, 2011
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Posted on Jan 02, 2017
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