98 Taurus codes
I have a 98 Taurus with the 3.0 duratec. It has 183k miles. I am getting 1131,1151 and 0340 trouble codes all at the same time. The car has the original O2 sensors and fuel pressure regulator. The car starts and runs as normal, except when letting off the accelerator, the revs drop quickly and the car slows more so than before, but does not stall or stumble. The fuel economy is off also. I checked for vacuum leaks, cleaned all electrical connections and cleaned the MAF sensor. The IAG valve is fairly new also. I am thinking the fuel pressure regulator may be going, The 0340 code is puzzling also, as the timing seems fine, no problem starting, running or accelerating. Anybody have any ideas on what I should do/look for?