Cheap? Denso Iridium's are $14/ea. at my local Autozone! I think I saw that there are some cheaper (champion?) iridium plugs on the market now. I just did mine yesterday in about 30 minutes.
My CEL is still on, but it runs better. At 102,000 miles, it probably needs an O2 sensor too - the old plugs were bright white. Time to reset and get the codes read
By the way, whoever suggested the camshaft or crank sensor is bad is probably wrong. Those hall effect sensors /usually/ either work or they don't. They don't get out of adjustment or anything silly like that.
Have you checked all 6 coils' impedance? The shop manual should tell you how to test them with a cheap multimeter. I think Autozone sells one for around $25 that would work great. It's pretty easy even if you're not a mechanic or electrician. If the shop manual doesn't say, search the 'net for instructions on testing coils. The VX coils aren't all that different, just smaller.
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