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You need to be data logging.
The switch to map4 is a safety feature, ignoring it is not a good idea. read up on n54tech, it explains the situations that cause a map 4 switch. The number of times it flashes the dash indicators when switching tells you what fail safe is engaging.
You will need to data log and get it to switch to map 4 to see what is really wrong.
Did you replace spark plugs and coil packs when you installed JB4?
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