P0300 Code. Random Misfire NEED HELP!

[JcGTP39]

Okay I'm so stumped on this one guys did everything that I know that could cause this issue. It misses at idle. when you put it in drive you can't feel it cause there's a load on it.
What I've done
New Plugs gapped to .60
New wires
New Colis
Up stream O2 sensor is good replaced that 4 months ago
No Converter
No Downstream O2
Tested the the coil Module like 6 times test out good
Could it be the injectors or possibly a PCM? I just orderd one from zzp for black Friday should get on Wens, tell me what you guys think thank you

[Explicit_Spade]

Are your plugs in the right order?

[01gpgt01]

what mods do you have?

[JcGTP39]

Yes wires are on the right plugs. Tripled checked them lol.
And my car is stock besides a CAI

[Explicit_Spade]

What are the new plugs, wires and coils?

Is the new O2 a splice in?

[JcGTP39]

Plugs are autolite double platinum 104 I had delco ones in it still did the same ones. Wires are NAPA premium and so are the coils and the o2 the OEM one that plugs right in

[Explicit_Spade]

With just a cold air, you shouldn't be running 104s. Switch them out with stock temp plugs and your issue should go away.

[JcGTP39]

Same thing*

[JcGTP39]

I did. I had AC delco's in it that had like 5000 miles on them and did the same thing. I got a smaller pulley and that PCM and SLP headers ready to throw on just want to fix this first before I do

[Explicit_Spade]

OBD-II Trouble Code: P0300 Random/Multiple Cylinder Misfire Detected

A code P0300 may mean that one or more of the following has happened:

•Faulty spark plugs or wires
•Faulty coil (pack)
•Faulty oxygen sensor(s)
•Faulty fuel injector(s)
•Burned exhaust valve
•Faulty catalytic converter(s)
•Stuck/blocked EGR valve / passages
•Faulty camshaft position sensor
•Defective computer

[JcGTP39]

Yeah I read all that. But if the cam sensor was bad that would throw a code same with the EGR. If the exhuast valve it run really ****ty when your driving. So I'm down to PCM or injector.

[Explicit_Spade]

If it's a single injector it should be a cyl code instead of random, and I really doubt that the PCM just decided to go out.

The CPS won't always throw a code when it is going bad.

Can you still hear the fuel pump prime? Is the fuel filter clogged?

[JcGTP39]

Yeah true lol. Yeah fuel pump is good possibly could be a filter im going to do a fuel pressure test tmrw at my college and see what it's putting out. I wouldn't think a cam sensor would have anything to do misfire.

[JcGTP39]

But thank you for the help explicit

[stonecold0469]

i would insist in coils or wires...

i have had like 3 p0300 in like 2 weeks dealing with the details of the proyect.
just recheck everything.

i doubt it is PCM nor inyectors.

[JcGTP39]

Right on man. Yeah maybe i got a bad coil from napa or something but im working on it all day so hopefully I'll figure it out

[JcGTP39]

Well found out its cause a rough idle because sense I cut the cat off and the downstream o2 sensor it's dumping a lot of fuel into the motor. It's running really rich. We will see if anything changes once I throw that new PCM on.