If you had the pressure tested and is actually low after setting, then the only thing to look for is a leak, If there is no line leak as in the tubing not the connection, there are usually only three connection points for fuel lines at the tank, fuel filter or fuel injector rail, these are most likely place to loose pressure in the line, usually evidence by stains or liquid fuel present
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did you measure fuel pressure? other problems may exist. Start by cleaning the throttle bore with spray carb cleaner and an old toothbrush. Spray cleaner into idle air control valve or its opening and lastly clean PCV valve or just replace it. How many miles on the car?
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