There is many things that could be wrong....... did you break in the new cam.....did you adjust the lifters properly........is the timing set correct...........how are the plugs/wires/cap/rotor/fuel filter......many things to start checking. I say start with the basics...
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2007 Avalanche LT. **
6" Pro Comp lift
305/55/20 BFG A/T KO'S
K&N FIPK GEN
II
Flo Pro V force muffler & 4" slash cut stainless tips
Color matched front and rear Bowties
3" polished stainless bull bar and Nerf bars