Help 2006 with code p2146
 

Have a 06 5.9 would idle rough from time to time on start up then clear up for last few months not too often though sometimes sputter when on it a bit going down road started it the other day and didn't have as much power idled a little rough then cleared up next day same thing but engine light came on and ran like garbage threw code p2146 let it sit a day started it no change was thinking I might finally need injectors if anyone could help that would be great