RPM fluctuations

[Bryanluster1]

(02-07-2019 )Chamberpains Wrote:  O4 is not a cm871 its a cm870. And that kind of 10 rpm fluctuating is normal. My 06 does the exact same thing. But if your paranoid, check your actuators, run the over head, perform an injector bubble test, check and rebuild your IFSM if necessary, remove your fuel pump and ensure its in good condition and change your fuel filters. This may smooth it out some.

I thought mine was an 871 cause the way the entake goes up and wraps around top of motor from off the drivers side. When did the 871’s come out.? 2008? I just read this ok I have a 870 and it doesn’t do much between the rpm’s.