It is the I.A.C. (idle air control) located inside plenum. Dealer normally stocks this part. approx. $50.
For a 1999 Mercury Grand Marquis : ( the engine air filter is Motorcraft FA-1668 )
Yes.
no
The cabin air filter, in your 2004 Mercury grand Marquis, is located behind the dashboard on the passenger side. The air filter is directly behind the glove compartment.
No. A 2001 Jeep does not have a cabin filter.
99 G/M has no filter.
That car doesn't have a cabin filter.
If there is a PVC valve and hose and filter connected to the air intake, oil could be sucked up from the valve covers when the throttle is applied. perhaps the PVC valve needs to be changed.
motorcraft 820 S
According to the 1998 Mercury Grand Marquis Owner Guide ( and one of Fords websites ) The ( Motorcraft FL-820-S ) engine oil filter is used
The 1997 Mercury Grand Marquis owners manual shows : ( Motorcraft FL-820S ) and fordparts.com shows : ( Motorcraft FL-820 ) for the engine oil filter
Likely the fuel filter is clogged so you need to change it. If you can keep the engine running by pumping throttle a few times at start up, and then it runs, check the filter; cost about $10.00. On My 1999 Mercury Grand Marquis I had to replace the Idle air control valve because it did stay running until it was warm