Having the wrong octane in the system will make your car ping, but I dont believe it would make it shudder and shake. Especially at idle. I could be wrong, but I believe you have a tune problem, not so much a gas problem.
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2007 Satin Silver GT w/ Black Stripes
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GMS Strut Tower Brace / FRPP Springs
BBK CAI / Brenspeed 87 tune / Steeda CMCV / Hurst Shifter / Mac SS A/B
297 rwhp - 319 ft/lb torque
"Dear Leader" of the Mild Bolt-on Crew
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