I'm assuming you meant a 3.1 liter if so I would check you fuel filter and pressure to start with, whens the last time filter replaced? let me know. pressuure should be 28-32psiat idle if low and filter is clen pinch off rteurn line if pressure gets to 75 psi or better replace fuel pressure regulator if not fuel pump needs replacing. if this helps an accept would be appreciated if you need more info let me know.