car doesnt boost, 3sgte shop swap dont boost??-wont go past 4k rpm now Options

[RUNNIN-LOW]

alright guys this isnt my car..so dont ragg on me..he just needs alittle help and im kinda stuck on what i should do..im thinking its the head gasket..ok here goes
the car was taken to a local tunner shop (now out of buisness) they said that they could do the swap and will get the car dont in like 2 weeks or so..so i help out ordering the motor and got the harness to tweak and all..so since all that was settle we got the motor and harness together and all the other good stuff right..2 months goes by and the shop tell us they have been to busy on other stuff..so i tell them(my buddy) to go and just pull the car out and pay them for what they have done.. i go there with them and nothing have been done with the car..i get pissed at my buddy and go off on him(my buddy) why the fing didnt you just let me do the swap..and why the hell does a tunner shop do nothing when they have all the parts and anit doing jack....
i tell the shop owner we are taking the car and thats that!!then he said we can get the motor in and waiting for parts..they are prepping the motor (head gasket and plugs and all that stuff..) i just said ok by the end of the week we want the car done and motor in with all the recipet and everything you said you did to it..so we get a bill like 3gs head gasket and all the plugs top of the line things too...we tow the car back home and make the exhaust and everything..he hops in and drive it everything starts up fine he comes back 5 mins later and shaking his head and says you drive..
i go in to drive the thing and when i go to boost the motor just stalls out ..the motor is still running but the car wont hold boost it just stalls out and wont go past the 1lb bar. it drive fine and everything but cant boost. try going back to the shop but they closed down and we cant do nothing about it..so yeah he is looking for help before i rip apart his motor and check everything...(i feel the love when he doesnt even trust me fixing his car) <-----dont worry he doesnt come on this forum

yeah thats my issues just want to know what everything thinks before i play scienctist...thanks

mods done to the motor: 2nd gen 3sgte ,front mount intercooler (i installed for him everything is fine),2bar map, fuel pump, oem cap rotor plugs the whole works, and i think thats all i can remember..

This post has been edited by RUNNIN-LOW: Aug 21, 2008 - 10:37 AM

[RUNNIN-LOW]

OK more info now..no leak on the piping...harness is good...ok here is what is happening,... now that i finally took time to drive the thing again....the car has a very low idle..when i drive the car hard 1st or 2nd (i wont go past 3rd or try too)..the car doesnt go past 4k rpm....you can feel the turbo spooling up..but once the car hits 4k the car jerks really bad (also the even if you try it wont go past 4k) untill you let go of gas or change gears...what do yah think now??bad head gasket???

This post has been edited by RUNNIN-LOW: Aug 21, 2008 - 10:28 AM