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One of the new coil packs was faulty. Replaced it and misfire is gone. Thanks for the feedback guys.

The plugs are all NGK Iridiums I pulled all plugs off and they all seem in very good nick. The first one had relatively more soot buildup then the other five and was also a bit wet. there was a bit of liquid around the spark plug in the well. The coil on this first plug seems faulty - the collar actually moves back and forth a bit and there is a small white streak on the black silicone(?). this is one of the new Fuji coils I put in Thursday. I replaced the faulty coil pack with one from the old set and it seems to have worked - No more misfires. Hopefully the misfiring is gone for good this time. Fuji Ultra Coil Packs are made in Japan apparently. they have a red jacket on them. Yeah, $345 is pretty cheap for coil packs.... Thanks for your help guys. much appreciated.

Had a misfiring problem - took it to local mechanic who replaced one coil pack and the car was running well for 1 day then misfire returned. I used one of the diy tutorials to replace all coil packs. car ran fine for approx 40kms then started misfiring again - nowhere near as bad as they were misfiring before I changed all the coil packs but misfiring nonetheless.What could be causing this? Spark plugs had been changed 7 months ago. also noticed that the two coil packs had different numbers on - 4 of them are numbered 543, 1 is 791 and another 8X5. they all have HANSHIN MCP1440 on the back of em except the one numbered 791 has MCP1340. Does this mean anything? All coil packs in there now are brand new ones FUJI ULTRA SPARK - sold by www.OSAKA.co.nz. As you've probably gathered, I am a newbie. Help please! Quote MultiQuote

Also, starts misfiring only when engine has warmed up a bit and also only at low revs - is getting progressively worse though....

No, did not change plugs - they were all replaced about 7 months ago....(am checking them all today, though) I went a bit cheap on the coil packs - FUJI Ultra sparks (sold by osaka.co.nz) ($345 for all six)

Had a misfiring problem - took it to local mechanic who replaced one coil pack and the car was running well for 1 day then misfire returned. I used one of the diy tutorials to replace all coil packs. car ran fine for approx 40kms then started misfiring again - nowhere near as bad as they were misfiring before I changed all the coil packs but misfiring nonetheless.What could be causing this?? Anybody?

Thank you. Great tutorial - saved me a lot of time and money. I actually only replaced my coil packs as I knew they were at fault. Took just over 1.5 hours from start to finish.