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Going up a hill requires just a little more fuel. If the fuel filter is partially blocked you might not be able to get that extra when you need it. If you haven't changed the filter for a while, I'd try that. It can also be spark plugs but you would notice that any time you stepped on the gas hard.

check your distibutor for a loose pick up. alot off time vehicle will run fine but loss of power under load

If the timing is set correctly then you should check your catalytic converter. When the cat gets partially clogged the car will lose power only when going up hill. ( example: you are going 55 mph at the bottom of the hill by the time the car gets to the top you are going 45 mph. ) check manifold vacuum, if at 2000 rpm vacuum starts to go down to lower than 17hg then you should have the converter checked by a muffler shop.

Also this could be caused by the mass air flow sensor. I was having the same issue with my 98 jimmy. I bought some maf cleaner and havn't had the problem since.

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โˆ™ 2010-01-22 12:49:22
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Q: What would cause a 1993 Jimmy to lose power only when going up a hill?
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