Dear Bimmernuts,

since a few months, my E34 535i makes a stuttering sound at acceleration, as if the engine misfires and the power is suddendly reduced. I want to notice, that I only drive the car every 3-4 weeks for a few kilometers. The spark plugs where recently checked, so I assume it must be the fuel pump? I will try to jump wire the fuel relay ports this weekend to listen for the fuel pump operation at startup. Can you suggest any good tools for measuring the fuel system pressure? I could only find cheap gauges online, which do not seem very professional.
Thank you

Best wishes
Jazz