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All the replies here are excellent.
I'll add that a new overboost sensor opens the circut at 1.3-1.35 bar, but as they age the rubber diaphram inside ages and gets soft so they start opening inconsistantly and at lower boost pressures.
Mine would open at .9 bar and sometimes would take up to 30 seconds while I sat on the side of the road.
I mounted a male spade teminal on a metal intercooler bracket next to the overboost switch so I could could get out and move the overboost wire over to it and continue on.
Then I bought a new overboost sensor from pelican. It was a special order and cost around $60.
Another possibilty to your engine cutting out is if you are using the origonal metal braided/sheilded spark plug wires, and if there is no plastic cap over the tower of the upside down fan housing mounted igniton coil then those grounded, braided spark plug wires might be routed right next to the primary terminals on the ignition coil and under decel or accel the g force might be just enough to move the spark plug wires enough to touch a primary terminal on the coil and short it to ground killing the motor.
It's unlikely but distantly possible....
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