possible boost leak, videos on you tube will explain how to do it better than me
pressure testing it may save swapping more parts you don't need
the OE fuel pump wiring can go bad with age and lower the pump voltage,
I guess it's got a walbro 255 lph pump already?
the badly designed OE tank needs over a 1/4 of fuel
but this reads as more like a boost leak so far
low idle speed when cold could be Idle air control valve not working properly they came get stuck
from engine crud build up inside or just fail
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