Engine is sluggish and has no power?

1988 CHEVROLET CELEBRITY
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PFLYNT
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Engine is sluggish and has no power, aslo does not like hills. Already changed spark plugs, and cleaned fuel system.
Jan 4, 2006 at 8:00 PM
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SMOKINFLOYD4.3
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try the mass airflow sensor, and/or the MAP sensor, does it huff black smoke?
Jan 5, 2006 at 12:00 PM