My girlfriends 51 A4 tdi has loss of power when it rains heavily, never when its not raining, so im guessing its a connector thats getting wet or the EGR valve?
List of things I need to check that Ive found on here are:
Grease MAF contact
Injector wiring harness
EGR solenoid and valve
Fuel filter (doubt its this as only in the rain)
Coil packs (doubt its this as only in the rain)
Anything else to look out for?