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Are you all using at least 91 octane gas? If your car is running rough it's a good idea to put some Lucas Fuel Treatment in your car before spending more money on trying to fix a problem.
If that doesn't help, it could be the coil packs, the sparkplugs may need to be changed, or it could be the knock sensor. When any of you gun it does your SES/CEL flash on and off? Or is it already on?
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