Sometimes, especially after the car has been run hard on and off, while driving or cruising the car will pulsate...it will bounce between about 1500 - 1100 RPMs almost rhymitically, its not a random pulsation like a misfire would be, so i am thinking maybe my a few injectors could be clogged or maybe i have an intake manifold leak? i havent encountered this problem yet and am looking for any ideas to what may be going on, hopefully someone else has had this problem before.
thanks alot for everyones time.

 

Do you mean the idle speed of the engine is surging?

 

no, the "cruising RPM" (1500-2000) is where it starts to surge, i've neeeever had it do it from an idle and if you slap the thing in neutral and rev it up to about 3500 or so for just a second, the surging will go away, it may come back later on that day or then again i might not have the issue for as long as a week, thats why im so damn confused by this issue and was seeing what everyone thought of it, appears no one wants to touch this question with a 10 foot pole lol

 

I had this same problem with my car, and could never figure it out completly. I did notice on a scan tool that the egr would go from 0% to 100% and back to 0% when it would surge, so when I got my mail order tune, I just had the egr and evap codes deleted, and just unplugged it. It may of been my o2 sensors, I dunno. Not a problem with it unhooked though

 

isn't this known as cam surge? I would think it would be corrected in the tune wouldn't it? I get it every so often in my car, and if you blip the throttle a little it corrects it. It seems to happen more when im in a higher gear at lower speed.

I have a computer tune for CC305 instead of my CC503 right now, so that might have to do with it.

 

ooook, this makes good sense being as the pcm regulates feul and all, so it could be my tune, its not a major issue and theres no need to panick when it happens right? i just put on headers and will be sending of for it to become retuned shortly, so maybe i will be getting it fixed