I have a 89 lsc m vii does the heater core affect the temp stay a the hottest on the l in normal

SOURCE: 1991 Lincoln Mark VII LSC spark plugs and wires

A pair of decent long handled pliers/plug boot remover are recommended. apart from that, maybe some swivel pieces for the plug socket to get at funny angles.

recommend you:
- buy decent wires & plugs.

-put a dab of silicone on every wire boot to ensure easy fitting.

-Be verycareful when tightening the plugs so as not to crook the socket and crack the porcelain on the plug.

-Plugs should have a dab of copper grease or similar on the threads

-Plugs do not nee to be super tight, they have a compression washer at the base of the threads or a tapered thread fit that seals them well. only tighten them with a short length 3/8 ratchet not a big 1/2 inch - you'll strip the thread and regret that forever.

-Always make sure the wires dont touch the exhaust manifold and make them look like you just bought the vehicle, nice and straight and in tidy rows. You'll need a flat screwdriver, short, to undo enclosed plug wire harness mountings. be patient, they do unfasten ok once you suss em out.

-plugs are usually already correctly gapped. check them. gap can be check with Autozone or where u get the plugs from.Note the gap may be brand dependant - bosch platinum take a different gap to cheapo champions....

Hope you get a good job done
:)

SOURCE: 1991 Lincoln Mark VII LSC spark plugs and wires

you don't have to worry about a special tool if you are replacing the wires but you will need a 5/8 socket with a rubber boot and an extension and maybe a swival to remove the plugs if there is an auto zone near by they will print you out a diagram for free

SOURCE: Dashboard removal, 1988 LINCOLN, MARK VII

If you have never done this before, you really need to go get a Haynes or Chilton manual for this. They run about $25.00 and have step by step plus pictures. I've done one in my carreer and will never do another. And it was for my son. Believe me, it's a task I don't wish on anyone.
Go check out a manual. Google "Haynes Repair Manuals". It's worth it.

SOURCE: Trenton, NJ, what's a fair price to replace a

its about an 8 hour job roughly

SOURCE: Motor shuts off during the ride 89 Lincoln Mark VII LSC

It is probably in the ignition controle module, this is a common problem with some modules. Once it gets hot it will cause the car to shut down. You can remove it and get it tested. It can be located in one of two locations on the bottom of distributor or on the driver side fender well.