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Richard, ASE Certified Technician
Category: Ford
Satisfied Customers: 15305
Experience:  12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.
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99 grand marquis: the intake manifold,now the car runs..rough..hoses

Resolved Question:

I also have a 99 grand marquis,Just replaced the intake manifold,now the car runs very rough,bucking terribly,any ideas like vacume hoses etc
Submitted: 6 years ago.
Category: Ford
Expert:  Richard replied 6 years ago.

Hello and welcome to


Sometimes when replacing the intake coolant will leak into the spark plug wells. Remove the ignition coils to see if there is coolant in those wells. Next double check the vacuum line connections and make sure the gaskets did not shift on you when installing the intake. Listen for a hissing noise on each runner and spray some crab cleaner around the intake and listen for a change in engine rpm.


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