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On my 1995 Chevrolet Silverado 5.7L, what causes a code 44?

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On my 1995 Chevrolet Silverado 5.7L, what causes a code 44? Low power and hesitation

Vehicle: 1995 Chevrolet Silverado 5.7L

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44 Lean exhaust

Low fuel pressure can cause this, vacuum leaks can also cause this condition so can the timing, which can be easy thrown off due to the timing gears which wears very easy.

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