Starts up idle's a tad off, then once you put it in gear the idle gets real rough. Once you are driving or apply any gas it seems to run just fine.

I have checked very thoroughly for a vacuum leak with several different mediums and I get no reaction.

I have cleaned the MAF and this has had no effect.

I unplugged the O2 sensor and nothing changes (probable cause?)

I pulled the codes from the OBD-I box and received a 2-3-2 from A2 and a 2-4-1 from A6 which I suspect is due to the manifold not having an EGR tube receiver so the EGR tube is just hanging in the breeze however it has been like that for almost a year so I think the 2-3-2 is the cause. But what is causing it? When I cleared the A2 codes the engine bogged way way down for about 10 sec and then went back to the sort of rough idle, I then drove it for 20 miles and the CEL did not come back.

PCV system has been serviced and checked regularly. Spark plugs and under a year old and are of premium quality and we only use premium gas and the air and fuel filter are fairly recent.

As always thank you for your help!

-Chris