So as I'm driving to college today my CEL starts to flash (it's been on cause of misfire cyl3 which I replaced) so I know from experience that it flash before it throws codes so I didn't study it a whole lot but I noticed loss of power lack of throttle response etc so after class I take ol girl to oreillys to get her scanned 5 codes in total
P303 misfire in cyl 3 which I replaced
P0172 system to rich
P0300 multiple misfires
P0307 misfire cyl 7 haven't replaced yet
P0357 I think is what it was which is bad ignition coil

Trucks an 05 KR 4x4
Replaced coils and plugs in cylinders 1-4 and 6 so I still gotta do 5,7,& 8 anyway I need help any help as to what to do besides change plugs and coils how do I test coils and what not how do I fix the system to rich?

Thanks Forrest

 

I used to regret getting the 4.6 VS the 5.4....not anymore

 

Man it's a pain I've owned the truck for like 2 months but i love it other than the problems

 

Bump

 

Were the COP boots and springs replaced when the plugs were done?

Why are you just replace 1 or 2 plugs at a time? Do them all at the same time. You are just chasing smoke instead of putting the fire out.

The plugs missing could cause your system rich due to unburned fuel.

You need to fix this asap or you will replacing cat also

 

Ran out of time and haven't got around to finishing it. And you mean the cats in the exhaust and yea I was thinking the the rich was from plugs.. But I used old boots they were fine new springs and new cops

 

Same here. Well I never regretted it I love my truck had the opportunity to get either one 5.4 was Scab and I wanted an Screw so it worked out better in the end

 

Bum

 

Well got the it's changed codes went away till the other day now it's the misfire and the system to rich again

 

You may have a bad injector?