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Check your air filter. If it's dirty, replace it (or clean it if you've got a reusable). Also, if this is the first time you've changed plugs, it can be a pretty difficult experience changing out the one on the passenger side nearest to the firewall. Several people on the board say that...

Shop around. My local Costco has cases of Mobil1 for $22. That works out to $3.66/quart. That's the best price I've seen. There's a NAPA in the neighborhood that sells it for $6+ per quart. Yeow!! (Synth oil tends to come in 6 quart cases at the stores.) --Steve

The only minimum I've heard is to wait until after the initial break-in period of the engine. Supposedly, synthetic lubricates so well that it can prevent good ring seating when the engine is new. (On the other hand, some cars like Vipers and Vettes come with synthetic as factory fill. Not sure...

Thanks for the link, Mark. It's helpful. Another question, if you don't mind: What's the best way to access the leads on the TPS connector? The probes on my multi-tester are too fat to get in there. I've been looking around for skinnier ones, but so far no luck. I've seen the type of...

Sorry this isn't an answer to your question, but I've got a question about this myself: I did a KOEO scan on my wife's '91 Eddie Bauer 4.0 OHV, and it returned a 63 -- TPS voltage too low or grounded. I've got the Haynes manual, but I'm a little unclear on the test procedure. Can either of...