Note that my post on AF was about timing on my 2000 Xterra. The 2001 has the exact same procedure but the timing spec is different. I think '01's are to be set at 10 degrees BTDC +-2 whereas '00's are 15 degrees. Double check that before you do it!
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ChuckH
"Every morning when I wake up I know it's not going to get any better 'til I go back to sleep again!" Al Bundy