so im drivin home from washington right now and my car has a gsr and is poppin a code for the o2 and has a walboro 255lph and motor is stock just exhaust and ram air were cruisin at 60 barely in throttle and its like chuggin and stutterin once u give it gas it goes away any ideas why lemme know thanks

 

a bad o2 can make the car feel choppy in closed loop. the other obvious area to check is ignition timing. verify that you're at 16deg btdc@750rpm and that you don't have a plug, wire, or distributor issue. first replace the o2 or make sure you don't have a wiring issue. once the code clears, drive it. if the problem is still there look into ignition timing areas

 

idrivesideways is right you could have arcing issue with the sparkplugs/coilpack