System too lean PO 171

Toyota Corolla 2001 1.8l 170000 miles
My car is running too lean plus scan tool read random misfire and cylinder 1 misfire detected I replaced intake and throttle body gaskets I replaced all vacuum hoses I replaced all the coil packs took car to numerous shops they cant figure out why its still running lean also I get a backfire in the intake system
Denny from United States 2 years ago  
DE
2 reports 
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