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I have a 1993 F-250 4.9 I6 cyl. It rums good at idle and misses as you accelerate. It sounds like a plane running out of fuel, but the exhaust will burn your eyes. I have two put alcohol in the fuel to pass emission testing. I did a complete tune up plugs,wires cap and rotor to no avail. any ideas. thanks for the input
 

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Naturally, check for codes, but it sounds like you may be burning rich or maybe a head leak. Check plugs for fouling (yes, I saw you changed them), fuel pressure, and cleaning the MAF sensor.
 
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