I have 98 12v all afc mods 60 hp injectors boost elbow #11 fuel plate and 3 to 4 straight piped I run 28 psi of boost and my question is every once in a while my truck will push a lot of black...I know un burnt fuel as things are turned up..but only once in a while...or more than normal black...I'm not 20 anymore..LOL..and am not a so called coll roller...was just wondering if it was posibly bad injectors..or something. ..I'm also tow a 6000 lbs 5th wheel...any ideas would be appreciated..any so truck has regular maintenance and pushing 500.000kms.

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