Hi Paul,
You'd better do the whole drains scenario mate.
Just after I bought mine, had a big downpour while parked at work. Got in after work, drove the car out of the compound gate and stopped to close and lock it and wore a bucket of water down the back of my head!
Carefully drive home (not far and quiet roads fortunately) and heard gurgling from the HVAC system before it spat a bit of water at me!
I had blocked rear sunroof drains (which filled the roof liner and drowned the battery box, entertainment cubby, and spare wheel well) and blocked HVAC drains (which filled the HVAC core and drowned the rear mats and flooded the under floor vents)!
No water in plenum amazingly.
Cleared, cleaned, and blew out the drains, mopped up the mess (No lasting effects from the Bose amp or parking sensor ECU being drowned).
I installed a tow bar not long after, which required bumper removal, so cut the silly dust nipples off the rear sunroof drains.
You can do the same to the ones in the front wheel wells.
Assuming no codes that can't be explained by fuel starvation, MJ's low fuel scenario sounds pretty plausible to me, as does Johanne's, if filling your tank doesn't solve your fuel issue.
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Cheers
Marty
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Current:
2001 Audi S8 - Brilliant Black with Black interior, C5 RS6 rims (whenever I actually put them on...), Solar Sunroof, Tinted side and rear glass, RNS-D, Grom, Bose, clunky old phone in arm rest!
2002 Audi S8 - Project
Replacement head coming arrived  thanks to MJ
Silver with Black interior. All features as the '01, with the 'S' mode auto shifter. Dodgey rear tint (need to find a way to get rid of that).
Family:
2009 Volvo XC90 V8 R Design - has a louder more obnoxious exhaust than the S8, sounds great! Love this thing - Q7 was double the price, and certainly not double the car!
Sold:
1997 Audi A4 - Hamilton's Club Sport, Achat Grey (will miss the old girl)
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