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If the pinging is because of carbon build up, seafoam will work great. I've used it in alot of cars with great results.
I highly recommend both seafoam and MMO.
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1992 Maxima SE 5spd- Lots o mods. Maxima Guru 
1968 Mustang Coupe 289ci Auto- Awaits 331 Stroker/T-56/Full Discs/and more.
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