99 Grand Marquis Ignition Issue (I think)

[Kaysboat]

My 99 Grand Marquis just started doing this yesterday. When going up a hill, and/or under acceleration between about 55-65 km/h it starts to buck a bit. When I let off the accelerator it sometimes goes away.

I'm thinking this is likely an ignition issue (had this problem before I even bought the car, and the dealer changed one of the ignition coils. Problem solved for over 2 years). My car has the Coil on Plug set up, so it had eight ignition coils. So, I'm thinking that the problem is one of the coils. However, they are about $60 each, and don't want to replace all of them. How can I tell which one is pooched? Any other ideas on what this issue could be? Thanks.

[Kaysboat]

Also, I read the shop manual, but it said refer to the ignition and emission manual for daiognostics. I don't have the ignition and emission manual, hense the post.

[sly]

check for codes to see if you have a misfire on a certain plug. That's probably the culprit (or the cable connecting to the plug from the coil may need replacing).

[91waggin]

Try a straight up tune-up first. Rather than replacing coil packs, just replace the wire from the coil packs to the spark plugs (has a spring in it) and the spark plugs themselves. OEM for your car is Motorcraft platinums.

[v8only]

my bro had a miss on his late model bullitt, and i'm pretty sure the computer will tell you exactly which cylinder has the miss, if it does.

[Kaysboat]

Yup, had it scanned (mechanic didn't charge me. Nice guy), and it was a misfire in cylinder #2. 10 minute coil and plug change fixed the issue. She runs like a top again. Thanks for the help.