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Message: [QUOTE="john3_16, post: 863217, member: 53961"] Does it sound like the motor is surging (a strange rise in rpm's) when you let off the throttle and approach the lower rpm's ? If it is it sounds lean...You can actually go to a fuel like VP C12 and it will automatically richen things up across the range and eliminate the pinging...With the increased octane you can also go to a pretty crisp jetting without the motor knocking. Wether or not it's lean, good fuel should get rid of the ping. [/QUOTE]