Loses power on hills on 1991 Toyota 4Runner

I loses power going up hills. The bigger the hill slow it get and uses more fuel on the bigger hills. runs great other wise.

by in La Grande, OR on September 02, 2013
1 answer
ANSWER by on September 03, 2013
possible vacuum leak, map sensor, or problem with ignition system
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had a tune up, flushed the fuel line, lube done, started losing power going up hill, what can it be?

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