Having problems with your 1987 Mercury Grand Marquis ?
Why does my 1987 mercury grandmarquise bog down afer it shifts to a higher gear.
I had a Mercury Grand Marquis that had a similar problem, poor low end performance and bogging down after shifting. I replaced the mass air flo unit and no more problem, also it might help if you clean the throttle bore and related parts , make sure to use the proper cleaning spray to prevent damage to coating inside bore
Repair Help & Product Troubleshooting for 1987 Mercury Grand Marquis
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