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Hi,

My 96 TBird has been getting trouble codes P0171 and P0174 (System too lean).

The Long Term Fuel Trim is 25% (very high) at idle. It goes down to zero as the RPMs increase to 1500.

I have replaced the MAF sensor with another used one, and the results are nearly identical.

Question: Is it most likely a vacuum leak causing this, or is there something else I should check?
 
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