Sorry for trying to be helpful, you're the one throwing parts at it willy-nilly. I'll keep my opinion to myself.

i sent you a pm zalfrin, to keep this thread clean.

i said something about the L67 pump.

you never gave me reasons as to WHY i should put one in.

Well its kind of obvious why, your boosted now, you should have the boosted fuel pump.

code 0300 just popped up : Engine Misfire Detected

I wouldn't continue driving it until you get this figured out, p0300 only pops if you get a ton of activity on your knock sensors.

I know shops don't want to work on a modded car, but it seems like you would be able to find one that would just do a fuel pressure test for you so you can make sure you're attacking the right system. Not like you're asking them to do debug work, just a test.

k. im done driving it then.

I thought you were going to keep your opinions to yourself? LOL j/p.

Tim, I think you are on the right track with it being a fueling issue.

Good luck!

i mean, when i was driving it, the misfire goes away when i press on the throttle. I texted lonezerg and he asked what my ltft's are at idle and they are 16.4. The idle trims have been at that number since i did the swap 2 months ago.

Dang, i wish i knew what i was doing with a tuner, because than i would putz with it myself. I hate having to ask people constantly to help me out with my problems.

fyi, shop manual diagnostic aids for random misfires are:

check grounds (clean and tight)
abnormally low maf reading causing engine to run lean
damaged accessory belt or device connected via accessory belt
vacuum leak or malfunctioning crankcase ventilation valve
fuel pressure
injectors
bad fuel
leaking egr
dirty o2 sensor

what were the operating conditions when the check engine light came on?

we made up.

Tim, misfire only at idle/low rpm and low ECT points to dirty o2 according to shop manual. Supposedly you just need to run at > 15g/s MAF at operating temperature to eliminate the deposits.

did the CEL just illuminate, or flash?

the car was idling when p0300 popped up. i had over 50 misfires.

no flash. just illuminated.

when did you last change o2?

good that no flashing, flashing indicates cat damage possible.