Barometric Pressure Sensor

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Hi all, have recently brought an Mr2 mk2 tbar 1991, however i keep having problems starting it up and when its really raining the engine cuts out, has happened three times within 2 weeks. I had a diagnostic done on it and was told that the barometric pressure sensor is the problem, however i have no idea where that is. :( I have a few copies of SW20 /21 original manuals, yet still cannot find where it is. Any help would be greatly appreciated. :) Cheers all