misfire under load?

[eclipsegsx69]

i have had code 303 and today 304 . acting up really bad just keeps getting worse. when idling its perfect, as soon as i get on the throttle about half way in any gear 1-5 starts sputtering falls on its face and sometimes backfires. if i let off it runs like crap for about 15-25 secs. then its fine again. if i stay on it cel comes on. i read many other posts similar but not exactly this problem. any clues would be appreciated. sorry this message is so long i just feel like i'm driving an stock rs, and its killing me...

 

[GreenGVR4]

What is the 303, 304 code for on a 2G? TPS or something?

 

[eclipsegsx69]

303 is misfire on cylinder 3 and 304 is misfire on cylinder 4

 

[Vivid]

Random misfire codes... Very common codes. Change your plugs and you will be amazed. My plugs start missing every 6k miles.

 

[eclipsegsx69]

i had ngk bkr6evx-11 platinum plugs in it for about 20k changed to ngk iridium 2k ago still same. but i'll give it a wirl.

 

[Tsi]

our cars use a waste spark system =which means car can fire right until it is put under a load
OBDII any 300 codes are engine misfire the last digit is the cylinder that
is misfiring.

 

[eclipsegsx69]

ok changed plugs, gapped them correctly, put factory wires back on and still does it but even sooner and worse then with the moroso blue max spiral core wires. tried to check resistance in coil pack but i think i was using a crappy meter and wasn't read accurately. my last choice is a new coil pack. i'll price it tommorow.