Help Won't stay running

[sweetls]

I have a 2000 ls v8 that wont stay running it stalls as soon as I start it i checked the codes and got p0301-p0420-and po306 any help would be greatly appreciated

 

[tireman]

Does this model have the IAC valve?

The IAC valve on my V6 throttle body needed replacing. You could start the car and step on the gas to keep it running. But once you let of the gas it would stop.

 

[tireman]

codes

301-310 misfire
420 catalyst efficiency system below threshold bank 1
use of unleaded gas, oxygen sensor,misfire condition

 

[sweetls]

so what do you guys think vcg's and some coil packs and maybe an 02 sensor will do the trick?

 

[tireman]

Questions

Is it misfiring? What are the exact systems? thanks

 

[sweetls]

well i have had misfires a couple of times and brought it back to the dealer he put coils in it like four times but never did vcg's he is a retard and i'm sick of dealing with him so i am gonna fix it myself! this past time it started a missfire the day before then on the way home it would not accelerate and once home it will not stay running anymore just starts and stalls right out
(did i mention the dealer is a RETARD) sorry just venting

 

[joegr]

Also check the MAF for bugs/dirt.

 

[tireman]

Hmmmmmm

So it starts? we know you have spark.........but stalls right out?

Bad gas? Huge vacuum leak? Maybe someone else have this problem?

 

[Frogman]

Plugged kitty cat....?