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My 87 jimmy is really hard on gas, we've changed the filter but other then that I don't know what to do, or check. Any suggestions.
 

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What Jimmy? Full size or S15...? V8 or V6...........2.8 or 3.4..?

My 2.8 S10 Blazer was hard on gas.....found a bunch of cracked, split vacuum hoses. Much better now.
 
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