I'm not sure about the fuel filter.
In many cases with EFI engines, having to open the throttle in order to get the engine to start is a sign that crud is on the throttle body and/or idle air control, which makes the passages smaller than they should be. Once you get rid of that crud, if the problem continues, it may mean that the idle air control motor does not open as it should.
__________________ ION II 5AT with 2.5 inch stainless exhaust piping, Magnapack resonator, and Flowmaster Hushpower muffler. |