I have seemed to have a slight miss like feel at idle for about the last month. It has been getting slightly worse and worse. You feel it at idle in your seat bottom, I can feel the truck slightly shaking with it does it. When running down the road no problems but at idle is where it starts.

What do the experts say?

 

Could be something or it could be nothing. Know anyone with a scanner that can read live data? Does it idle the same in all tunes? Does it always idle rough, or just sometimes? How much worse has it gotten in the last month? How long since the last oil change, and is it full?

 

Don't have anybody with a live scanner, oil change is less then 2,000 miles, only have one tune, it has gone from every once and a while to every light I stop at it does it now.

 

Might try a different cps if u have a spare- See if it helps any

 

is the skip random?? if so, I have the same issue..We have replaced CPS(black),ICP,IPR,..now believing its an failing injector.in my case #3 is showing off on the rotational volisty test..i am going to swap 1 and 3 just to be sure its the injector...

 

Good idea with the injector swap. Be sure to have some o-rings on hand in case you find some chewed up ones when you pull the two injectors. (if they look fine I wouldn't replace them for a quick test). The Ford Gray CPS and some aftermarket (black0 CPS can cause the high readings on #3. Something else to consider is the old fashioned eyeball test while watching oil discharge from each injector.

 

You guys have got me worried now talking about injectors. I have 245,000 miles on her so I guess it is a real possibility I sure hope it's something cheaper then that though. I have been wanting to get the auto ingenuity go I can do a buss test but just havent had the funds yet. I do have a spare cps I can try. I will Update when I change out the cps, I just have a cheapy as a spare so if it works I will have to get a good one to replace it with.

 

Small update, I checked the oil and I was a quart low. I will see how it goes when I take it for a drive.