StonedCL

iTrader: (1)

OK about 2 weeks ago all my check engine VSA maint lights came on , So I scanned the codes when I got home and it was P0300 , P0301, P0304 randon misfire and misfire in cylinder 1 and 4.. I had a misfire months back But car shook bad and did not go over 50MPH and that was a bad coil that I replaced.
I also remeber the gay put the wrong gas (reg 87) in my car and it came on 100 miles after the gas was put in so I figured it was bad gas cuz cylinder 1 fires 1st followed by 4, so I reset and fill the half of tank w / super.
Today 500 miles later the CEL lights came on again but car STILL runs fine and today it was P1399 (undefined) and P0301 misfire in cylinder 1..
I changed my plugs at 150K miles and have 172K now , what can it be? Dirty injectors?
What do u guys think, car runs FINE, good but misfired 2 times in the last 500 miles (2 weeks) what can I try (cheap) to fix it.. I just got a new job at infiniti so I need it to last a yer or so cuz I just closes on a condo and can't affford my G37X coupe just yet!!

Silvaccordex01

iTrader: (2)

bad coil it sounds like

StonedCL

iTrader: (1)

If it was a bad coil pack wouldn't the car idle rough? I had these misfire codes before when the coilpack was bad and the car shook and could not drive it cuz it would not go over 50mph . This time car drives fine and performs great no rough idle or shaking at any speeds?

camaroracer016

This happened to me when I first got my car. It's only happened once and went away. I've heard it could be caused by condensation or moisture.

CL-S progression 01

iTrader: (2)

dude just SEA FOAM the car and see what happens. I did it to my bro's car last night and it worked WONDERS.

Take all the crap out of the inside of the motor and maybe that'll straighten things out.

It's definitely worth a shot!

StonedCL

iTrader: (1)

I will try a whole can of seafoam in the gas tank if the light comes back on but about 100 miles since i shut it off and it not back on yet!

CL-S progression 01

iTrader: (2)

no it's more important to let it get sucked in from a vaccume line. use 1/2 a can and when ur almost at half suck enough up to stall the car
then restart in 5 mins and rev her up then take for a 10 min RIP. and all should be swell

StonedCL

iTrader: (1)

I did seafoam the vac line about 10K miles ago and after i did that I took apart my IM to clean port and install spacer, scrubed it down good..
I think I gotta focus on the gas tank to clean out the injectors..

CL-S progression 01

iTrader: (2)

tru then yea I'd do the injector then you're right