Exhaust for a 97 lincoln town car

Hi Laddybug:
I'd be suspicious that something is contacting the exhaust system.
If possible I would get the car up on a hoist )preferrable) or jack stands for an inspection.
Most muffler shops that I know would do a quick inspection, often at no charge. They make their money IF work needs to be done.
Hope this helps.

You can go to YouTube or buy a Chilton's Manual online or any auto parts store.

Yes, the muffler should be upstream of the resonator. In other words, from the engine, you have the catalytic converter, then the muffler, then the resonator is last, near the tail pipe. Possibly they installed the wrong muffler or resonator. The muffler will have the most effect on the sound you hear.

Yes your right they all suffer from this idle and the problem is the IAC, (idle air control) These engine are sensitive to vacuum leaks and cannot control unaccounted false air, a new IAC will solve this but get the updated one also check each injector look at the o-ring seal make sure they are not cracked and not missing.

they have a problem with the idle control motor or valve which ever you want to call it. all you need to do is replace the valve.

vacuum lines could be a problem you might want to check the catalytic converter if they get clogged the motor doesnt breath very well hope this helps you bob

the adapter kit. go to grant steering wheels website and look it up.

Sure if you want to go all stock... Stock exhaust is expensive...
Look in the phone book for a muffler shop. these guys kow their business and I bet on that car you can get the whole thing NEW for about 600 bucks or less..

To diagnos the catalytic converter, remove exhaust Y pipe from exhaust manifolds and start up. If engine runs goood and revs up, then suspect a restriction in your exhaust. Exhaust shop should be able to fix the problem. Cannot repair the cat converter. It is a honeycomb of metals inside that superheat the exhaust and burn off any unburnt fuel. When the honeycomb melts from contamination then it blocks exhaust air flow.