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Re: 1996 grand marquis tranny shutter at 55 - 60 MPH
You might want to check your coils and plugs. Sounds like a long shot but I have had similar problems with my 2000 and both times it was the coils. When under gentle acceleration at speed, the car would shudder and seemingly misfire. Mostly it feels like a lurch in the drivetrain.
At its worst it was accompanied with a momentarily soaring temp gauge and even complete engine shut down at highway speeds. New after market coils was the answer... even the dealer mech. could not diagnose it.
Just went through this issue again and found that one or more of the coils was shorting to the head through the boot. Careful reinstallation seems to have corrected it.
Regards
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