you might have read my previous thread a few weeks ago, just an update. its a 03 hemi and completly randomly my truck will start to idle ROUGH from 300rpms to 1300rpm,the smell of gas is obvious, smells flooded, and sometimes dies and takes a min of turning over the engine for it to start, and when i start drinvng and it hits over drive it shakes pretty bad. but itll quit idling bad and everything about 10 min after it starts then it may not do it for another 2 days or so. pulled some codes got 2 random missfire codes, one read "random cylinder missfire" and the other was a little more specific "random missfire cylinder 6" i did decided to change my plugs(i do NOT reccomend if you have a hemi), i cranked the truck after every cylinder i changed, and and my engine code actually went off, then i finished and dissappointingly after 5 hours of screwing with the plugs it started to idle horrible and check engine flashed, just like usual by the time i made it to town it stopped idling bad. everytime i take off from a stop, even if im very easy on the throttle itll bog down for a sec then do a rough jump and run fine, but its every single time i stop... quite annoying. ive went over evap system , nothing stood out, i changed my downstream o2 today, still does it. last resort is im gonna take it to dodge and have them run diagnostics. any help before i fork over a bunch of money to the dealership??

 

Just a wild guess, bad or intermittent cam sensor?

 

i do believe i replaced that when we put the 260 comp cam in about 2 yr ago... thanks though

 

bad fuel injectors?

 

Did you replace the stock springs when you did the cam???

 

im thinking its the injectors ,if im replacing em i wanna replace them with better ones, any ideas

 

I know a lot of guys running mild cam upgrades (Comp 260, KRC 210, Crane 216 & Sidewinder) who have had issues at low RPM and every one of them fixed it by going SCT or Diablo with a custom tune. A/F ratio was off at low RPMs and had to be bumped. It seems the "canned" tunes (SC, Bully, Diablo, etc.) just couldn't dial the cam in.

Seems to me with a canned tune a piggyback would probably work too - something along the lines of a Split Second PSC-1 or ARC2 might do the trick...