I am needing a little help. I finally got back to working on my truck. I got it running, It will fire up run but will not Idele, as long as you stay in the throttle it will run. Here is the kicker, had no exhaust to speak of just down pipes. Will this engine run with out cats? I have OEM cats that were on it I just don't want to use them unless i have to. There are no emission laws here so no worries about that. I am gonna have full exhaust put on with maybe just some flowmaster 40's