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    Tune Up Help!

    I have a '99 w/ the 4.0 SOHC w/ 173K. Good engine, but it needs a tune up. She's pulling some low MPG's, around 15 combined. I have cleaned the throttle body mulitiple times, and cleaned the MAF as well. Near as I can tell, the plugs are original (I got her when she 9,000 miles) as well as the...
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