my truck's rpm's aren't smooth when driving but it goes in like chunks but I don't have any codes... (Very small chunks maybe like 25 rpm at a time.)
almost like detonation or something
i don't feel anything though
revs smooth in park though

Any ideas?

 

hard to see but worth a shot:
http://varsisstudio.com/forumimages/driving/

 

damn dude, got enough amber lights lit for ya? did you rescan that truck for that CEL. im aware of the active code for the speed sensor, anything else?

 

o2 thats it i hear dodges have bad tachs. so im thinking thats the issue.