2005 Mazda Mpv Hard Time Hills Changed Spark Plugs Coils Helped Little Still

2005 MAZDA MPV
140,000 MILES
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My 2005 Mazda MPV has a hard time going up hills. I changed the spark plugs and the coils, it helped a little, but it still has a hard time with really steep hills. What could it be?
Dec 14, 2012 at 12:45 AM
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JACOBANDNICKOLAS
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Check catalytic converter to make sure it isn't plugging.
Dec 14, 2012 at 1:34 AM
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