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That's great!! BUT...if you have an '86 SEi you don't have carbs...it is Fuel Injected. You can synch the throttlebodies. The backfire seems to me like maybe an injector is a little dirty. Try some Seafoam in the tank to clean things up. Other than that it may be a very small vacuum leak. The backfire is a lean condition (too much air to gas ratio causing a "pre-ignition" during no-load conditions). Could also be a spark plug that is misfiring. Pull the plugs to check them. If you have the manual...check the troubleshooting section.
That's great!! BUT...if you have an '86 SEi you don't have carbs...it is Fuel Injected. You can synch the throttlebodies. The backfire seems to me like maybe an injector is a little dirty. Try some Seafoam in the tank to clean things up. Other than that it may be a very small vacuum leak. The backfire is a lean condition (too much air to gas ratio causing a "pre-ignition" during no-load conditions). Could also be a spark plug that is misfiring. Pull the plugs to check them. If you have the manual...check the troubleshooting section.