Alright well I have my first real issue with my LNF. To get started 2 days ago after driving home from school a check engine light came on. Checked my interceptor, basically saying the P0303 code or Misfire Cylinder #3. I'm gonna start with the most obvious thing and that's to change the spark plugs out. Not sure if it's a bad idea to swap between coil packs and see if I can get a misfire on a different cylinder. The last thing I want is to have to change the injectors or worst. So far the car has been idling roughly upon start up and sometimes on the road feels like the engine coughs a bit. Any advice would be greatly appreciated.

 

im going through the same problem but mines on #1. swap the coil packs around to see if the misfire changes cylinder. try some new acdelco plugs gapped to.030. if that fails try a compression test. also take a look at your maf to see if its dirty

 

sounds like plugs swap them out with stock ones to start, im not sure if I would go to .030 tho, id say lowest .032, im at .034

 

Swap the plugs and coil pack, set your intercepter to read misfires, and go for a drive. Gap them at 0.032 since you're tuned

 

I would do one thing at a time, instead of doing a few things then u wont know what fixed what and so on

 

Switching the plugs and coil pack does solve one thing at a time. If the misfire moves its the coil pack, if the misfire doesnt happen it was the plugs. Easiest and you dont have to wait twice for the engine to cool down.

If you want to save money do the coil pack first, but if youre going to switch plugs change the coil pack over too

 

Was having the same issue. Initially started on Cylinder 3 and then the other day it happened on both cylinder 1 and 3. Swapped out plugs and cleaned MAF. So far havent had any problems. Gapped at stock .035

 

I had the random misfire and then a focus on cylinder 1, so I installed new plugs gapped at 0.032 because of being tuned, and swapped 1 and 4 coil packs. All misfires are gone, so it was the plugs. If you're still on a stock tune by all means keep the 0.035 gap

 

I didnt mess with the gap yet as it was late in the night when I did them but I am tuned so I will probably regap them to the .032

 

I had a bad coil pack, car would run fine under normal op. But WOT I would misfire.
Replaced coil pack with new one from CED and bam killin em again good luck

 

Well me and amproz found the issue, the spark plugs had to be replaced. They weren't bad or anything, we ended up replacing them with NGK Iridium spark plugs, did a misfire read on the interceptors, everything checks out fine, no numbers except 0 all from cylinder 1-4

 

great news thanks for the update

 

Sure man next up putting back on the stock lower charge pipe :/ This is the 3rd time this has happened the the ZZP lower charge pipe the t bolt clamp does nothing for the mani. I'm thinking it's due to the engine rocking back everytime you floor the balt and wiggling the coupler loose.