Fryguy22

So its been three weeks now since I initially took my car to get inspected. 1500 dollars later (new tires, rear rotors, rear right caliper, 8 MSD coil packs, 8 plugs) my check engine light is still on throwing the same code: 300 - Multiple Random misfires. Does anyone have any ideas? I am very discouraged right now because nothing I do seems to work. Any help would be appreciated.
Thanks,
Matt

redass02gt

how new is your fuel filter?

these things cause a misfire:
-no fuel or no air or a fubar'd ratio of the two
-no spark
-no compression

Fryguy22

it has to be something fuel related because the spark has been taken care of. The weird thing is that the guy at the shop had my car hooked up to his computer and drove around in it for 10 miles and it was fine. So I go to pick it up and 2 minutes after I leave the light turns on again.

domesticlover

Camshaft position sensor (CMP).
Stuck open EGR valve.

2 of the leading syptoms

Fryguy22

thanks guys. I'm going to install a new fuel filter tonight as well as check out the EGR valve. I'll let you know how it goes.

domesticlover

ok good

Fryguy22

alright so now my car doesn't misfire under WOT, it misfires around 1800 RPMs. What are some possible things that could be causing this?

2000GT4.6

If none of this stuff works could be an injector problem or the ECU screwing up as well.

xxkazp3rxx

Are your plugs misgapped?

Fryguy22

injectors are being checked out today at my shop... so i'll let you know how that turns out

plugs are fine