i will post the codes i have tonight when i go home.

if it is running lean, i dont see how you could tell if something was restricted.

 

Low fuel pressure could definitely cause your problem. With low fuel pressure, the ECU will adjust the throttle body to restrict air flow to match the readings that the O2 sensor is supplying. Could be a clogged fuel filter too.

If ECU is pulling alot of timing, you can bump up the fuel pressure a little to see if that helps.

That's all I got. Anything else would just be a guess.

 

how would i bump up the fuel pressure?

just replaced the fuel filter 2000 miles ago....dont think its clogged.


maybe this is being caused by a faulty o2 sensor?

 

You would need an adjustable FPR to bump up the fuel pressure. If you don't have one, there's nothing you can do (that I know of).

 

could it be from a faulty o2 sensor?

 

Not entirely sure what the problem is, as I'm having a similar problem. Have you checked your spark plugs?

 

i just replaced the stockers with 1 stage cooler Bosch plugs when i did the k04 install. Problem started a week or 2 after this all.

What problems are you having more specifically? What have you tried so far?

 

In addition to what's posted here-
Check the diverter valve in case it's stuck open
Replaced a few vacuum lines that were rotted
Changed coolant temp sensor (unrelated)

 

Those would all cause similar issues. I replaced my DVs with Hyperboost.
All my vacuum lines are perfect, CTS was just replaced 2 weeks ago.

What is your car doing whrn u give it gas? is it building boost as normal? or lagging?

 

It will lose the vacuum pressure quickly, but when it starts making boost, it takes a very long time and even with my foot to the floor it barely speeds up.