RPMS fall off at 2800 back to 2400 then back up to 2800 fall off...happens both under load and stationary steady throtle,

have replaced cam sensor, and 1 ox sensor, had those two codes as well as codes for ATS and EGR valve

which is a more likely cause? more details at LHS sppecific forum also

thanks for any help

 

How is your idle? High, low or inconsistent?

 

Idle smooth at about 900-1000 with no throtle applied