Having problems with your 2003 Mercury Grand Marquis ?
Just purchased 2003 merc gm
\015 Just purchased MGM 2003 . At speeds above 35-40 felt as if engine skipped at light acceleration. Scan at ford dealer showed nothing . Only 50 k on car . Mechanic suggested injection cleaner. 2 cans later same problem . My favorite parts man at local independent store suggested I change trans filter . At 50 k needed anyway , so I did . He was right . Problem solved . Can't beat experienced parts guys . I did it 30 years but am lost now. I quit in !995 . So different now .\015
Solved by owner
Repair Help & Product Troubleshooting for 2003 Mercury Grand Marquis
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