Re: I'm rattled....
Assuming that you have no "check engine" light on or any other driveability problems, the first thing I would check would be the EGR valve. If it is carboned up or otherwise not working properly, it can cause pinging like you're describing. Cleaning or replacing it can fix it if this is your problem.
1993 5.0 LX 'Vert
GT-40X303 heads, E-cam, 1.6 roller rockers,
Cobra intake, Edelbrock 65mm t/b, 73 mm C&L, CAI,
24 lb injectors, AFPR, 3.73's, March underdrives.
FRPP headers, Bassani catted X, SLP Loudmouth.
This thing is loud!!!
Pony R's with Eagle ZR's, stock AOD.
Cervini's Air Extractor hood
2003 GT seats
Springtime Edition mirrors & wing
ff member 157