Sputtering sometimes stalling

Hi and thanks for using 2CarPros.

My first suspect is fuel pressure. At higher speeds, the engine requires more fuel. If the pump is having trouble keeping up, the symptoms you described can occur.

Start by checking that. Here is a link that shows how in general it is done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the directions specific to your vehicle for testing. The required specifications are included. Also, the attached pictures correlate with these directions.

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Fuel Pressure Test

Special Tools Required
- Fuel pressure gauge 07406-004000B
- Fuel pressure gauge attachment set 07AAJ-S6MA150

1. Relieve the fuel pressure.

See Picture 1

2. Disconnect the quick-connect fitting. Attach the fuel pressure gauge set and the fuel pressure gauge.
3. Start the engine, and let it idle.
- If the engine starts, go to step 5.
- If the engine does not start, go to step 4.

4. Check to see if the fuel pump is running: Listen to the fuel filler port with the fuel fill cap removed.
The fuel pump should run for 2 seconds when the ignition switch is first turned on.
- If the pump runs, go to step 5.
- If the pump does not run, do the fuel pump circuit troubleshooting.

5. Read the fuel pressure gauge. The pressure should be 320-370 kPa (3.3-3.8 kgf/sq.cm, 47-54 psi).
- If the pressure is OK, the test is complete.
- If the pressure is out of specification, replace the fuel pressure regulator and the fuel filter, then recheck the fuel pressure.

Let me know the results or if you have other questions.

Take care,
Joe