1991 Grand Marquis LS turned off on me I replaced

In maintenance work a tune up would include new spark plugs, if is fitted with a distributor then replace the distributor cap and rotor. if your spark plug cables are old (more than 100,000 miles) may be good to replace them. replace air filter abd cabin filter. check the hoses that carry coolant. change oil and filter. It may be a good idea to change the coolant also to change the transmission oil.

spark plugs ,rotor button,and cap ,oil,air filters,spark plug wires if you haven't change them in one year and five quarts of motor oil

Thanks for choosing FixYa and welcome. For a tune up, you would need to change spark plugs, coils, distributor cap, coil pack, and wires. You would change the air filter and the fuel filter also. Change your pcv valve as well. You can also change all your fluids and filters, such as oil, coolant fluid, and transmission fluid.

It may have jumped time. However, if you smell gasoline, it got flooded. Here is the lay of the land.
If it cranks, as in turning over but not starting. And you smell gasoline. The fuel is good, but there is not electrical spark going to the plugs. Bad coil. Cracked distributor cap. Moisture under the cap. Check this before you worry about the timing. You first have to test for ignition. Also don't pump the gas when starting it. See what happens. Also when the car is warm, never pump the gas. Also check the wire going from the distributor cap to the coil.
Good luck,
Hope this helps,
Best,
Mark

Spark plugs, spark plug wires, distributor cap, and distributor rotor. If you replace all of these you would be doing what is called a major tune-up.

A regular tune-up would be just replacing the spark plugs.

You can check the integrity of the plug wires and distributor cap by spraying them with water while the engine is running. If the engine runs ruff, stall, or you see spark arcing from either the wires or the distributor cap than they will need to be replaced.

The distributor rotor always gets replaced when you replace the distributor cap.

You can also spray the coil with soapy water to see if it is leaking as well.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

1st. You need to change the spark plug and wires if necessary.
2nd. Check and replace the rotor distributor and cap.
3rd. Change oil filter if necessary.

Goodluck

depends on how much you want to spend.

tools you need.....socket set with a 5/8 sparkplug socket,plug gapper tool, and the proper gap
parts you need, sparkplugs,plug wires,fuel filter,air filter. replace each plug one at a time, change plug wire at same time. there should be no other adjustments needed as its all controlled by computer.

I would change the spark plugs, spark plug wires, distributor cap and rotor, fuel filter, check and change air filter if dirty, check timing, check and top off all fluids, check or change transmission fluid, check brake pads/.shoes and drums/rotors for wear and check tire pressure, check the condition of all belts and hoses and replace as needed, check condition of radiator antifreeze and top off or replace as needed.

Replace the fuel filter. If you have a fuel-injection system, regular cleaning isn't necessary unless the injectors are clogged.

Step 2 Change the spark plugs (unless they're platinum, in which case you have 30,000 more miles to go). Also examine the spark plug wires and replace as needed. A new set of high-quality wires is worth the cost. They may be permanently attached to the distributor cap, so it will have to be changed as well.

Step 3 Replace the distributor cap and rotor if your car has them (some newer models with distributorless ignition don't).

Step 4 Change the points and condenser if you have an older car (roughly 1978 or older) that doesn't feature electronic ignition. You'll actually want your points changed, or at least adjusted, every six months or so (if they're changed, check the ignition timing as well).

Step 5 Check the ignition timing and adjust as needed (rare for a car with electronic ignition--post-1980--and some cars don't allow this at all).

Step 6 Adjust the valves as needed (unless your car has hydraulic valves). Be sure to replace the valve-cover gasket as well, especially if you see oil on top of your engine.

Step 7 Check the belts. Replace if worn.

Step 8 Check the fluids under the hood and replenish as necessary. Change the oil and oil filter if it's been 3,000 miles since the last oil change.

Step 9 Replace the air filter, which should be changed between major services--every 15,000 miles--as well.

Step 10 Adjust the clutch, if you have a manual transmission (although some cars now sport self-adjusting clutches).

Step 11 Service the battery, adding distilled water (if required), cleaning terminals and cable ends.

Step 12 Replace the PCV (positive crankcase ventilation) valve. It can make your car run rough or stall if it gets clogged, and it's cheap and easy to replace..... hope this helped mate. Rate out of 4 above...

The new system is called a DIS (digital ignition system). Plugs are changed the same as usual, just without the cap and rotor. Instead of a single coil, now the new system has COPs (Coil over plugs) installed, these are recommended to be replaced around 75000miles and they are costly. hopefully this helps