I have an '06 sport and was wondering if the PCM is programmed to not allow the RPM's to exceed 3K in P or N? I exceeded 3K on the tach while not in gear and the truck started missing, running very erratic. Why would I do this, you ask? I have been trouble shooting a cylinder four misfire for a couple of weeks now (I think that I am going to have to replace the heads) and was running it through all ranges to see where it would smooth out and where it would miss. When I hit 3K- well you know what happened...

 

yes, it has a rev limiter in P and N

 

but it wouldnt miss and carry on like yours is...the tach would just stop at 3k...theres something else going on with your motor

 

its very normal. all the (new) autos have them. haha if you get some open exahust you can play with some people and say its launch control lol

 

Thanks for verifying that for me y'all. I searched the owners and the Haynes first but couldn't find anything to confirm it.

DJ, I think it has to do with the head problem that I am having, as I have changed everything else in the troubleshooting procedure... We'll see what happens after I get the new heads.

 

Sound's like it's doing what it was designed to.Your truck has a 3k rev limiter in park.
The tach will jump around when you hit it.
If you take the truck out and drive it hard [over 3k rpm]does it still miss?
If not all is good.