weird idle/ doesnt sound the same

[6.0slowstroke]

i just had 225cc injectors and a new altenator put in my truck...
normally my slowstroke whistles at idle but now it sounds like my turbo is unplugged and doesnt whistle but it isnt(stock turbo so maybe all the extra fuel?), took if for a ride and it smokes like crazy and doesnt feel as fast as it used to be with just a chip but i dont have any tuning done to it now so that might be the problem there(and my tranny needs built now) plus my up pipe leaks a little but when we plugged the scanner into it it said i had 41psi of boost at wot but the code says turbo/supercharger low boost condition

second problem is at idle it sounds like it misses. this happened once before and i replaced the pedal and that fixed it and since i have a bunch of throttle postion codes im guessing thats the problem again


just looking for some input on what some other people think the problems are cause im only 19 and dont know all too much about diesels yet thanks in advance


idk if this matters but mods are:
egr delete
225cc injectors
intake
exhaust
will have tunes from rcd as soon as they write them