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AMSOIL P.i. is more effective and has documented test results on how well it works. I might be able to get you the NGK spark plugs at a lower price than you'd pay elsewhere.

Sure sounds like a vacuum leak somewhere. The way to diagnose this is to use a pump spray bottle of water to spray all gasket area's, vacuum lines, hoses etc. Do this with the engine running and slowly spray an area a small section at a time. If you suddenly spray an area that makes the idle...

No, the serpentine belt wont affect the engine idle. All it does is spin various pulleys that run your cars power steering, air conditioning, power steering, alternator, etc. If the serpentine belt has many cracks in it, it should be replaced before it breaks. I encourage you to spend a few...

Welcome aboard the Corolla Forum Ray! :) I think you'll find a lot of great information here. Don't be bashful about jumping in, the water's fine. :)

How many miles are on the PCV valve? Is it presenting any problems?

Electrical gremlins are never fun as they usually don't have a simple book answer. Sounds like some kind of electrical short.

Video - Replace PCV Valve of Toyota Corolla - http://www.youtube.com/watch?v=h5M1LqIdca4 To test the PCV valve, shake it back and forth and listen for a rattling noise. If it rattles, it's still working, but if it doesn't, it's plugged. Many times the PCV valve can be re-used by cleaning it...

Modern stock air intake systems are usually very efficient if for nothing more than improved fuel economy.

For an online service manual priced at about $24 -> http://alldatadiy.com/

Find a junkyard where you can pull your own parts and look for a car just like yours and experiment with the attachments to see how it works. This will provide you solid information.

You can try searching YouTube, or purchasing an online repair manual for about $24, (if memory serves me correctly), from -http://alldatadiy.com/

I'm personally not aware of any. You can try Googling it. Good luck with it.

Matt, if you can get this diagnosed for free I strongly advise you take advantage of that. Cars are virtually always a situation where if a repair or maintenance of any kind is not completed it will adversely affect another component of the car. Plus, having the annoying, "Check Engine", light...

Has the fuel pressure been checked?

A hyper/liberal/socialist/Democrat was re-elected President, so you can be sure mandated emissions testing for the entire country will eventually be forced in place.

Also don't forget to consider if doing this would be emissions legal.

http://www.advanceautoparts.com/

Well keep in mind how those headlights might appear to oncoming drivers who might be blinded by them. You wouldn't want to cause a crash. Headlights aren't really supposed to be yellow anyway, but they should be white. If they appear yellow, the bulbs may be old and need replacing, or the...