Constant pending OBD codes?

My 2007 V8 has been acting a little funny lately when its cold. This morning it seems it was almost hesitating with a slightly erratic idle from 750-500rpm. Decided to check the Scangauge and found there are constant pending codes that start with C, like C2900 C29A0 C2600. And when I say constant I mean like every couple seconds it throws another pending code. I can't do anything with these because there isn't an actual check engine light but driving any distance there might be hundreds of pending codes.

If these are constant pending codes I'm thinking its for something that is constantly running like a fuel pump maybe. Weird thing is, once everything is warm, the hesitation/slightly erratic idle goes away and it runs fine. Truck has 225k miles on it. Checked vacuum lines and it doesn't seem like any popped off.

Looking at how to read DTCs on YouTube and it does seem to be an injector circuit malfunction (fuel or air).

Any ideas or where to start??

 

Looking at it again, C is chassis, 2 is manufacturer code?, 9 is transmission... uh oh. Hope this doesn't have something to do with me doing a complete transmission fluid exchange like 9k miles ago...

 

I think the Scangauge was going haywire on all the pending codes. Did a factory reset and ran the truck up and down the driveway and the Scangauge picked up a misfire on cylinder 4. What a relief! Definitely explains the stutter I was feeling.

 

Quick coil swap with cylinder 2 and the problem child moved, woohoo! New coil packs on the way

 

Glad you got that figured out. What coil packs did you end up going with?

 

Denso off Amazon. They had the quickest delivery for the best price ($55 ea delivering Sunday)