so i was stranded in 580 east going to dublin today for fuse short on the engine. what caused the short was the o2 sensor wires that is located on the exhaust mid pipe hit the chassis causing the fuse to short and loose engine power. when we installed the new fuse the car started but is idling at 1500 rpm. when i stomp on the gas there is a slight stutter then boost comes on. when i gradually step on the gas slowly boost comes on like normal. is this the infamous p0300 code? mods as follows:

p2 reflash
hks cams
TBE
HFC
hks SSQV BOV
and a slightly damaged rear o2 sensor

i'm going to call works monday morning for an appointment but before i do i want to hear some feedbacks from you guys. any thoughts on this problem?