If you try to mess with it in the state your sig says you are from, the emissions test might fail. (More than likely...)
The testing equipment is specific for each vehicle based upon the year/type of computer and the added emissions systems for each individual year/make/model/ECM. Usually testing must be performed when you have a hot engine, at idle and then under load.
Your computer will try to adjust the base fuel map and timing using the sequence of the EVAP/Purge system being functional.
Each setting changes, as the sensors react to engine temp, coolant temp, fuel pressure and the cat/O2 sensors warming up.
If you alter any of it, something down stream will not operate at the intended computer programming and timing sequence.
If you screw up the map, and confuse the computer, you could go into open loop or run off the backup base settings for limp mode.
This mode will get you home in a bind, however you will not pass emissions in this mode.
Your fuel efficiency will suffer and idle will be off as well.
GoToGuy said it more simple than me...
I would go further and say: If it is broke, do your best to analyze every perimeter and point of failure and fix all of it...
Rotten hoses and bad connectors need to be replaced.
EGR needs to be removed and cleaned thoroughly every year.
If your TBI does not look as clean and shiny as PlayingWithTBI's picture, you might want to invest in a quality rebuilt unit with clean matched injectors. Start by rebuilding your distributor to OEM factory specs, before you try and fix anything else.
Clean the heck out of the EGR, replace all your vacuum lines and do NOT rip anything out or you'll fail inspection and ruin your ability to properly diagnose poor idle. Make certain your CAT is not clogged... do not alter it if it is... replace it.
Until you relocate to a state, without emissions testing regulations, you cannot legally alter the OEM system.
