I can't tell you about beer, I only drink those! (Density of beer is about 1.1 the density of water google says! )
It's exactly what I'm going through right now, rough idle, almost no engine braking, and P1128 P1130 codes!
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Porsche Tech in France.
www.benautodesign.fr
Ben-Auto-Design : Performance parts for 9X6 / 9X7
1982 928 S Euro