hi, my car was running great for the last half year, suddenly the afr's went to
16-17 on cold start and slowly goes to 13.6 my normal idle. check for vacuum
and fuel leaks and all looks fine. The fuel pump sounds like always,the fuel gauge is steady at 48lbs at idle.

thinking on replace:
1-fuel pump
2-fuel filter
3-burn a new chip

any help thaks.