2002 BMW 325i Q&A

2002 BMW 325i Question: BM 2002 325i 155000,mile Computer read lean fuel mixture.

I changed fuel filter,1 oxygen sensor,good MAF,shrader valve, vacuum hose, appear good fuel pressure,work for wall and die on stop sign, from time to time air trapper on fuel line. all start after i got a hold of bad gas. I run of option need help. -
Answer 1
have codes scanned and post or seek diag and est -