bucking under boost

[flan007]

im having a wierd problem. my 97 gst all of a sudden starts bucking and bogging when i floor it after 5 lbs of boost. it holds 5 lbs just fine. anything above that and its starts bogging out. if i dont let the turbo spool the car runs fine. anything above 5 psi and it runs like ass till i go below 5 psi. any ideas???

 

[joeym4130]

Start off with simple stuff first? like plugs/wires or boost leak?
I had like the same problem, just had to get new plugs. Would only buck under boost, because that was putting a load on the engine. Try those simple cheap things first
Check for boost leaks, check IC pipes etc...

 

[Erok]

if it only does it under wot, then it is probly something with your emissions, might have bad sylinoid and egr valve isnt opening right, if its that i would just rip off the emisions and block off the egr and it will run better, thats if its only happening wot