1996 Chevy Silverado What could this be?

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96 CHEVY
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Engine Performance problem
1996 Chevy Silverado V8 Two Wheel Drive Automatic

i have a 96 chevy with a 5.7 vortec motor.That is acting like it has a bad miss., but i think it is loading up, because it is blowing black smoke out the exhaust. Truck runs good it has good power. did a complete tune up and noticed when taking out the plugs, the left hand side was burning good but the right side was all black. engine light is on, all three o2 sensors were bad and crank sensor. replaced the crank sensor. but truck still runs like it has a miss and is loading up
Feb 26, 2010 at 6:49 AM
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DOCFIXIT
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Pull upper intake manifold off check for gas in side. If present check fuel return lines and pressure for leakage.
Feb 26, 2010 at 7:07 AM
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