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could be a number of things...
1) boost leak
2) bad o-rings on injectors
3) bad piston rings (no compression on certain cylinder)
4) MAF needs to be cleaned
5) vacuum leak
6) re-gap your plugs to .25 to .28
7) bad coilpack (rare)
check your plugs, see what your motor is doing (lots of black carbon, lots of white burning etc etc)
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