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Discussion Starter #1
will be "missing" every few seconds on hwy (not really missing bad enough to tell around town) including if Cruise Control engaged.

Anything I should check before installing new plugs and wires (already bought...and past return date lol)? I DO have 'darkened garage' so I guess I can try to confirm in any big spark leaks, but I've had cars that got fixed after wire replacement that seemed fine in the dark.

It feels pretty much like missing issues I've solved with new plugs and wires on other cars such as Ford Escorts. Doesn't backfire or anything. Will new cars not backfire but just burn out the CAT costing a $1000+?

Fried plug wire on my 2002 GMC 350ci and it drove fine but cost me $2200 in smog repair.
 

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will be "missing" every few seconds on hwy (not really missing bad enough to tell around town) including if Cruise Control engaged.

Anything I should check before installing new plugs and wires (already bought...and past return date lol)? I DO have 'darkened garage' so I guess I can try to confirm in any big spark leaks, but I've had cars that got fixed after wire replacement that seemed fine in the dark.

It feels pretty much like missing issues I've solved with new plugs and wires on other cars such as Ford Escorts. Doesn't backfire or anything. Will new cars not backfire but just burn out the CAT costing a $1000+?

Fried plug wire on my 2002 GMC 350ci and it drove fine but cost me $2200 in smog repair.
I would replace the plugs and inspect the new and old plugs carefully. I paid a shop $330 to tell me I had a bad plug wire. New wires and plugs, pic of one, and it came back one year later. Same issue, same plug brand. No code, no sign of issues looking at the O2 sensor signal which would show a misfire. False lean but no code. This from DOHC but can happen to any Bull. Tec at Ford garage explained, not unusual. Radiation from the arcing upsets the PCM but does not really miss. It causes the fire to happen at the wrong time. Still fires so no code. If any plug has arcing, the wire is ruined as in the pic.
-chart-
 

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What brand / type plugs are in it? Use ONLY Motorcraft plugs or their NGK equivalent. Use ONLY Motorcraft plug wires also, not cheap junk from the discount parts store. Twice over the years I tried Bosch plugs in various Fords and they ran like crap. Switched back to Motorcraft or NGK, and they ran perfectly.

Agree on carefully checking coil pack for cracks, especially on the bottom. ANY crack, no matter how small, replace coil pack with Motorcraft or BWD coil pack only. Cheap aftermarket coil packs from the discount parts stores are JUNK.
 

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What ever you buy, check carefully visual as per the pic. As to wires, I would always ohm new ones. Our son had a premium brand set with one wire open. It missed at heavy throttle, F-150 inline six.
-chart-
 

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Had an issue on my 2006 that seemed like a torque converter lockup problem which ended being a failing coil but no cracks. After months of issue the coil failed on primary low voltage side and produced a code for it but no misfire code.
 

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Agree to pull the plugs and 'read' them, is each plug similar to the others, or one or two stand out? I have Bosch plug wires in both my '99 Taurus wagon and Sable. Clean the coil pack of any dirt and check for any cracks.
 
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