How many miles on your car?
It is not uncommon for high mileage cars to ping and need high octane due to the condition that you described. I think you are right on the money with your assesment.
I wish I had better news...I don't know any other way to clean it than to pull the motor apart.
Do you have a performance chip? Perhaps the timing is advanced to much?
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My Stang:
2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)
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