I got the P1800 code on my 2002 Nissan Maxima SE 3.5L. When I'm sitting still sometimes like a stoplight, it idles down and then it cut off.
Start by inspecting the hoses connected to the VIAS control solenoid valve. If the hoses are OK, then you may have to replace the VIAS control solenoid valve. The valve is on top of the engine:
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