Thanks for the update. I have been searching through some TSBs on your car and came across this one. It does talk about the coils for ping. See below...
TECHNICAL SERVICE BULLETIN
Reference Number(s): NTB01-059, Date of Issue: September 6, 2001
NISSAN: 2000-01 Maxima
SECTION: Engine Control System
APPLIED VEHICLE: 2000-01 Maxima (A33)
APPLIED VINS: Vehicles built before: JN1CA31A31T112164 (w/side air bags); JN1CA31A31T316031 (w/side air bags); JN1CA31D91T627134 (w/o side air bags); JN1CA31D91T830089 (w/o side air bags)
APPLIED DATE: Vehicles built before: March 16, 2001
APPLIED ENGINE #: Engines built before: VQ30-463753
Related Ref Number(s): NTB01-059
2000-01 MAXIMA; MIL ON WITH DTC P1320 AND/OR SPARK KNOCK (DETONATION) DUE TO IGNITION COILS
I wouldn't do the computer yet............Lord willing this bulletin about the coils it the answer.
Saturday, April 4th, 2009 AT 9:21 PM