Fouled plugs?
Are you running cats in the exhaust? If so, maybe getting choked up inside? (kinda doubt that one)
02 and temp sensors ok? TPS sensor calibrated? Full voltage to ECM?
Any grounds work loose? Throttle body get any junk in it?
Just some ideas. I am a total rookie with the LSx motors. However, my truck has a 5.3 and it was doing similar things and it was the plugs and wires.
Good luck.
__________________
Eric
1970 Camaro.....on the road someday!
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