new to the board

ive gone through the grounds thing, ill have to see if it is the egr, i noticed today, while hooking up my a/f gauge that the green line going to the egr solenoid(?) was broke, but when i fixxed it, nothing changed....i think i did it while hooking up the wires. i have been swapping out 2 different iacs to see if they were working, and i switched the wires around too. i think the atr header LOOKS good, but everyone says it cracks. im about to check my tps voltage again, but its freezing outside and im warming up right now. the only code that came up during koer was 23, tps out of spec for self test. while surging, according to my a/f/ gauge, it is very lean off the gauge lean, and when surging up, goes extremely rich. at idle, it was rich right after the idle smoothed, then started doing the disco thing going from lean to stoich.....but my friends 84 has the same gauges and this is what his does. i know that the diaphram on the egr is good, but i guess ill have to see if its opening. when does it open?