Okay. The next thing would be to check the fuel pressure. Again, Advance Auto and Auto Zone has Fuel Pressure Test Gauge test kits on a loaner program for free with a deposit. The kit will come with adapters to fit almost any application. The test port is on the fuel rail, but I have provided a diagram showing port with connected test gauge.
I have also given you the test procedure along with the diagrams and sub-procedures referred to in the instructions. The fuel pressure specs are in the instructions. I had to break the instruction into 2 parts as it would not fit into one screen.
If the pressure is too high or too low, it gives you the 3 most likely diagnosis of the issue.
If the fuel pressure is off it can cause the symptoms you are having and it will not generallly throw a code if it is off until it effects the air/fuel ratio enough that it overheats an O2 sensor or other issues.
So, do this test as it is the next step and has to be ruled out. While you are doing it, inspect the air filter and intake tract for anything that would block or impeed flow.
Let me know how this turns out.
Images (click to enlarge)
Sunday, November 20th, 2011 AT 4:58 AM