Changed fuel pump, fuel filter drove fine for two days then I flushed radiator the 2nd night drove for 2 hours and parked it overnight. Started truck next morning ran rough stepped on brake to put it in drive and it dies out. It starts fine put pedal to the floor and it cuts out and decelerates back to idle. Check engine light on with code p0171b fuel mix too lean.I can't locate any vacuum leak. O2 sensor 1 has 0.9 volts and #2 has 0.1 at idle. Manifold vacuum at idle is 4.5. Schroeder valve pressure when I turn key on is 55psi and drops to 30psi when at idle speed. My dads been a mechanic all his life and he thinks it might be brake booster problem Any help appreciated
have the same problem?
Wednesday, November 5th, 2014 AT 11:16 PM