Rpms?
 

Just curious...what RPM should a 2008 2.4L be running at 55-60?

Depends.
Auto or 5 speed ? And what gear is it in.

Auto and I think third. I'm having shifting issues. I don't think it's going into low gear and not sure about high gear. Is it a 3 speed or 4?

4 speed; What issues, exactly. We may be able to help.

It seems to start out ok, shifts at 25-30 and then doesn't shift any more. Changed fluid and filter, changed the intake solenoid and the (I think it is called) Trans control module. I can drive it at 55-60 running at 2500-3000 RPM

Got a P/0100 error code

That means that there is a problem with the MAF circuit. Changed the air filter just before it came on?

Yes, it could cause trans problems.

2500 at 65 is about right.

No, I don't think we changed it...perhaps we should?

MAF Circuit...sounds like more research :)

RPM's sound about right...

My 06 2.4 is right about spot on at 2000 rpm going 55

The MAF is that bit that you must unplug to get the air cleaner off. Either it is not plugged in correctly, a wire is broken or it is broken.

and that would not only effect idle but most likely the rpms it runs at speed correct?

Correct, and it usually sets a CEL

Thanks for the info, everyone

Thanks for the help, I will check it out

Could a separation in the air intake hose cause a problem? Just discovered this

If you mean the fuzzy pipe that goes to the fender; no.

If you mean the rubber pipe that goes to the carb; yes

It is the one that goes to the fender...TG

The cold air intake tube you speak of , commonly called the woolly worm, is abut expensive but can be replaced by a 3 inch diameter piece of dryer hose, the metal style like this

I just posted something similar.
My 5speed is at 70mph at 3000rpm. 5th gear

Your stuck in 3rd gear if it's an automatic.
4th would be 2000 rpm at 60 mph using 215/50R17 tires