What is required of a "Full" tune-up, assuming I need to do a full tune -up? Engine Light on and per diagnostic tool says Nbr 4 cylinder misfiring.

Asked by Apr 07, 2015 at 09:44 AM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

2000 Mercury Grand Marquee
170,000 miles
Running a little rough, especially uphill.  Don't want to spend to much as giving it to a friend, but want it in a good enough shape that it won't leave his wife and children stranded on the road.

2 Answers

67,255

Replace the spark plugs and the spark plug boots. Inspect air filter and PCV valve, replace as needed. Replace the fuel filter. HTH. -Jim

7,455

The 4.6 loves new plugs, it wakes them right up

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