1991 Geo Tracker losing power

1991 GEO TRACKER
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FAYERS
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1991 Geo Tracker 4 cyl Automatic
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I just had the sparkplugs/wires fixed today because my car was losing engine power really bad and it's still continuing to lose power, not as bad but still doing the same thing. I trying going up a hill and it'll drop to 20km/h with my foot to the floor. Also it'll lose power for a second while driving and at around 50km/h it'll start jerking some. What could be causing this?
May 15, 2008 at 10:17 PM
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BMRFIXIT
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check fuel filter and fuel pressure
check timing
Jun 16, 2008 at 9:26 PM