2005 Mercury Grand Marquis hesitates when stopped at red light while pressing the accelerator, what is the cause?

Asked by Aug 12, 2014 at 03:25 PM about the 2005 Mercury Grand Marquis GS

Question type: General

The accelerator is slightly pressed and the car is running and it hesitates to move.

6 Answers


The TPS could have. Bad spot in it, once you get over the initial stumble does it run ok.

1 of 1 people found this helpful.

Yes it runs ok till slow down to a stop again.


If you want to track it down for sure you may have to get the computer system "live data scanned" that way you could see what the ECM sees as the sensors send their signals to the computer.


sounds like map sensor very common to go bad very easy to replace two screws

1 of 1 people found this helpful.

Thanks I will get that checked out and let you know if that's the problem.

Possible Manifold Absolute Pressure Sensor (MAP Switch). It will jerk at low speeds and run smooth at speeds above 45 +-. Some times it shows no problems codes when checked.

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