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6 hours ago, M35wagoneer said:

P0171.... I was wondering if anyone could give me any advice if anyone else on here that struggled with the same problem ever resolved it...

Changed plugs coils fuel filter 

Make sure your O2 sensors agree with each other, make sure your MAF is generating sane values. Make sure your injectors aren't clogged or seized. Make sure your fuel pressure is good and isn't dropping out at higher load. Make sure you don't have any vacuum leaks. 

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