Rough Idle, NOT MAF.

[itsover954]

I posted elsware but must have been in the wrong section.

I recently started having a bit of a stutter in the low rpms of my 98 EB. I then got a CEL and scanned to find:

P0171
and
P0174

I proceded to spray the Maf with electrical cleaner, but to no avail. It actually ran worse. I then went and got a new Maf, but still no dice. What should I be replacing or checking? Thanks in advance for the help.

Replaced Maf still the same. Went and replaced the fuel filter, still the same but different codes.

P1131
and
P1151

Manufacturer control.
fuel air metering.

Anyone?

Pvc changed still stutters.

 

[pronstar]

How old are your O2 sensors?

 

[itsover954]

I have not changed them, bought used with 75k now have 115k

 

[itsover954]

Just found a leak on a elbow on the PVC vacuum line, still hear a little hiss. Hard to track down because my exhaust is loud. Anyone know how to use hose vacuum hand pumps to find them?

 

[itsover954]

Found the problem!

Link to what I did. Not written by me but it was the same problem.

http://www.azda.com/ford/