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You have some weird stuff going on - may be the cause of your problem.
Your cold pressure is quite high - but then we need to know the temp that was taken at - it is a sliding scale.
The pressure should rise to around 3.6 after 5 min. The fact it seems rpm dependant is weird also. Almost suggesting a voltage problem - for the pumps and WUR.
Residual pressure is good - no worries there. The pressure should not be jumping at idle.
I suggest you check the voltage supply at the WUR, and somewhere in the fuel pump supply side (front fuse box) while engine running.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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