Hey guys lately after i installed my new cat i have noticed on start up my jeep has a hard time finding it's idle. It sounds like a cammed car in the beginning and then the RPM's drop really low and then shoot back up and then it finds it's place and stays there. The jeep has never actually quit running but the RPM's seem to get low enough to warrent this eventually. What is causing it to do this. Is there a sensor that could be going bad or something it never did this before.
thanks for any info in advanced
2001 Grand Cherokee Limited v8 4.7L H.O Black, leather, fully loaded, tinted windows all the way around
1997 camaro Z28 Fully forged 355, Stage 3 heads, Gm847 cam, Nitrous,