Hi, have switched the car to a pair of HS6 SUs. Bought secondhand they seemed clean and correct. I suspect from my SU tuning guide that they were off an early P1800. However I just cannot get the car to run cleanly. Under acceleration car just stutters and misfires. Has twin Facet electric fuel pumps, Malpassi fuel pressure regulator. It ran fine before. Car is with local garage they are equally mystified. Any ideas? Thanks in advance.
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