have an 06 cobalt ss/sc. Has the stage 2 gm tune boosting at 15~psi.Issue is when i acclerate hard from low rpms i get a slight feeling as if im getting spark plug blowout ... but its very soft version... kinda like as its accelerating the car is very hesitant as the rpms increase. Kinda like every 1000rpms it hickups than contiunes to the next 1000-1500 rpms than does the same. I replaced the plugs.. gapped them to 37. The only mod thats on the engine is a injet cold air w/ MAF sensor. Car idles fine... running 91 octane... air filter is clean.. plugs look normal... From my eyes i dont see anything wrong... Faulty PCM tune possibly..any ideas guys

 

Regap plugs maybe?