Yours sounds easy.

The original, intermittant problem sounds like that classic failing fuel pump relay. Due to heat and vibration, the solder joints on the relay board fracture and open after heating up. It can be repaired by unplugging it from the fuse/relay block (it's the rectangular white one) snapping the cover off, and resoldering all the points where the relay terminals meet the PC board with a 25-50 watt iron. Or you could purchase a replacement and pop it in.

The service monkey mislocated or damaged one of the intake hoses downstream of the turbo, which includes every hose other than the one from the AMM to the turbo intake. The poor connection (or tear) is leaking air pressure under boost conditions only. Since some of the air measured by the AMM is not reaching the cylinders, where fuel was metered based on the AMM, the result is an over-rich mixture...almost bordering on flooding. I'm guessing the car runs OK in the negative pressure zone of the turbo guage.

Look especially at the clamping points that the hose ends are PROPERLY seated beneath each clamp and for tears where 3rd nipples are bonded to any hose - this doesn't apply if you have the Mitsubishi turbo.