My '07 4.6 STX runs good. However, of late and at idle the RPMs jump around a bit, maybe 200-300 up/down. It doesn't matter whether the transmission is in Drive, Neutral or Park. Also, the idle quality is OK, pretty smooth.

Being a 60's technology kinda guy I'm not familiar with late model electronics. Can this be diagnosed easily with someone with the right electronics/tool? Am I wrong in suspecting a bad sensor of some kind?

Thanks.

 

clean your IAC valve, that might fix it, its worth a shot.

 

No IAC 04+. Has a fly by wire throttle control.

 

my bad... still stuck in the past

 

I have an 08 mine does this too. I took to a dealer and was told its normal, an all do it. This is only the second time ive heard of this happening. If you find out let me know plz.

 

How many miles on the truck?