W1CK3Dlude

here is the situation. i just recently dropped all the stuff in my sig into my car and i started it for the first time today. it started just fine on the first crank. but it idles like it has huge cams. it surges. when i rev it up it is fine and sounds really healthy. i know i need to get it tuned but i was thinking that since i had my hondata tuned with my old setup this new setup shouldn't change the idle. my old setup was a stock block h22 with a greddy turbo kit and 550 injectors. i still have the 550 injectors since i know the 100cc injectors will flood it. my mechanic says that i just need to tune it because i'm running really rich during low rpm. but how would changing the motor and turbo kit make my car run rich, if i'm still using the same program and the same injectors. if anything shouldn't it be leaner? also i don't know if this helps but my compression is now 9:1 and i don't have the exhuast hooked up yet (which means 1 o2 sensor isn't hooked up), it just running open downpipe. would these factors mess with the idle?

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62-1BB turbo, hks 50mm wastegate, greddy type 24 intercooler, hks ssq bov, blitz turbo timer,greddy profec b boost controller, act clutch, walbro 255 fuel pump, b&m fpr, 1000cc injectors, probe rods, arias pistons, ported and polished head, ferrea valves with 5 angle valve job, darton sleeves, msd 6a, msd wires, msd blaster coil, megan 3in turbo muffler, custom 3in downpipe and test pipe, aem pulleys, f22 tranny with quaife lsd, and hondata......i think thats it.