VT Clubsport LS1 no power/surging

[shadow6ix]

Hey all
I have a VTII Clubsport LS1 auto.
I'm having trouble with it surging and a substantial loss in power. When its cold its fine but after around half an hour of driving it starts happening. If you put your foot down to less than half it really struggles to get going and surges. Give it WOT and it goes as it should. It has no codes and engine light never comes on. Been searching the forums but can't seem to find what I'm looking for. I have a obd scanner and the 02's volts are flickering as they should so I'm a bit stumped! Have cleaned throttle body and maf aswell
Any help would be greatly appreciated!

 

[mpower]

do you have a lot of glitter handy? I kid, I kid!

So only when hot, and "surges" or does it bog down then take off?

 

[shadow6ix]

If you keep it off wot it just runs like crap, doesn't sort of clear then take off.
Yeah we all need some glitter lol

 

[mpower]

does it sound like it's missing at all?

 

[shadow6ix]

Definitely not missing,
car is stock with cat back, ss CAI, and 110,000ks

 

[hotrod]

could be ya oxy sensors on the tail pipe , one on each side below the firewall, also maybe ya crank angle sensor, or coil breaking down as it gets hot,.. or leads

 

[Munz]

cats possibly blocked

 

[shadow6ix]

Bit of an update. Changed oxygen sensors and has not helped the problem at all
Have been working away so haven't had much of a chance to muck around with the car. Checked fuel pressure today and it hold 60psi no worries at all.
Just not sure where to go next! Any suggestions???
Its just strange how the car will heat up to operating temp in 10 min of driving but it takes 30 to 40 min of driving for it start running like poo..

 

[hotrod]

what about fuel filter or pump. or is it your alternator regulator spiked to high, its hard to diagnose can cost lots before u get to the problem.

 

[shadow6ix]

what about fuel filter or pump.

Pressure test come up OK for fuel pump and filter is new. And it worries me that it might be one of those throw parts at it till its fixed problems!