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If it's injected, run a diag test. A basic tune-up should help with more complete combustion. Plugs, wires, rotor and cap along with setting the timing. Also, make sure the air filter is clean. Replace it if there is any question. If you're getting too much fuel it could be ther air filter, if it's just not all burning it could be the ignition.

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โˆ™ 2006-03-16 21:23:44
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Q: You have a 1986 ford Bronco that keeps faleing the emissions test because of bad air to gas mixture what is wrong how can i stop the Bronco from emitting unburned fuel and inprove the milage?
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