You're not supposed to be driving it around if the SES/CEL is flashing.
SES/CEL 'ON' = something is wrong.
SES/CEL flashing = NOT GOOD
I had the same problem BEFORE I put my headers on.
Bogging a little, light flashing....
I am under warranty
and work at a Nissan dealer,
so the techs tried a few things.
The check list for this P0300 misfire is huge.
Many things to check and not cool for a tech
who is only getting paid warranty time (which sucks.)
We replaced the FRONT A/F ratio sensor on MY SE
and the bogging went away.
I'm still not sure that was the problem
because when I plug in the Consult II from time to time
the P0300 still shows a history.
My SES is pretty much constantly on and
I have no tuning right now (which MAY help),
but I have the Emanage Ultimate and Nismo cams poised for an install and tune.
05 Majestic SE
ebay $35 CAI (cut to WAI), SSAC Headers (ceramic coated), Greddy Evo2 exhaust, Eibach Proline, Nismo frt/rr anti-sways, AT ground, LSD (w/ 4.13 final drive), JW clutch, Fidanza FW, Gram Lights 57F bronze, Pirelli System 255/40zr18, Eracings fascia, AT S5, UR udp, AT SS