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How should I put the seafoam in? Straight in the gas tank or in a vacuum line?

Well I jut put in new plugs a couple days ago... surely they don't need cleaning. I'm thinking the same thing about the compression test. Not sure. And the transmission was rebuilt 55k ago. What does that matter?

Yea they are. So I went home and did a COP spark check with a little tool from pep boys, the spark was good, just a little orange. I checked the some other plugs and they are all slightly orange as well. I pulled the plug, a motorcraft, and it had a good Spark as well. The only things I can...

Motorcraft, That's what they were. My bad.

And it's a master craft brand.

Bill, thanks for your reply! Right now the only code I have p0306, but I have been having a bank 2 lean code a few times. That's why I was thinking the spark was firing, but the injector was clogged a little. I do still have the old plugs, and can try one tonight.

What's the best way to check them? I have a multimeter, would that work? And would I need the wiring diagram?

Thanks for the reply Potatoe! No, I haven't done that yet. Frankly I kinda scared to because I don't want to have to get inside the wire casing. Seems like it would be a real pain. Is there a good way to do this?

I'm driving a 2007 Eddie Bauer with 414,000 miles on it. It has been a company car with regular maintenance and mostly interstate use. It's really in great shape for the miles. So it started missing really badly and I went and got the code checked at o'riellys. Cylinder 8 misfire and both...