Problem:
Check engine light is on car and car does not idle at a steady RPM it drops in and out. When driving at low speed for a few blocks it gives the reduced engine power warning. It then tends to die if you continue to drive at slow speeds. Truck drives perfect at highway speeds!

Codes:
P0172
P0171
P0174
P0175
P0101

Solutions:
I changed all of the O2 sensors about 6 months ago and the truck ran a bit better for about 2 months.

I am thinking it may have a clogged injector but I am at a lost on how to interpret the codes it's giving me. HELP!

 

You can download the whole shop manual set for the LR 3 jn links below. Possible vac leak as well.

 

I had idle issues but it was at idle: not while driving. Truck would stall out if I didn't gas it. After some research I arrived at this solution; virtually no cost solution and it completely fixed my issue. No more idle issues. Couldn't hurt to try. Will cost you nothing and take twenty minutes tops.

 

Cleaning the T/B will take care of your issue at the moment, but you will want to have a full induction service done and check the condition of your PCV valve, as fixing the idle and faults caused by the poor idle are somewhat just the surface of the issue.