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Okay so the new vacuum reservoir arrived today, I tested the new reservoir with hand held vacuum pump and it holds vacuum fine, the old one in car does not hold vacuum, so I just pulled out the vacuum hose goes to the old reservoir and connected the hose to new reservoir on top of the engine with a silicone hose then cleared the codes and started the car, the car is still running lean, RKATs for both bank are pegged at 4.5% still! Also hooked the hand held vacuum pump to the hose that connects to the vacuum reservoir and it holds the vacuum too, so the new vacuum reservoir does not help to resolve running lean issue. I am out of idea what to check next.
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