Random flutter in AFR at idle whith logs, Help please lol.

[curtisdeville]

Hey guys, my name is Curtis and I am new to the site and tuning. I purchased the Efilive V2 about a month ago and have been reading up on tuning and buying movies and books ever since, I originally bought the V2 so I could have a tune for my lmm sent to me and I could update the ecm myself and I am a Chevy enthusiast to the max so figured I would learn to work on the tuning aspect of my car on top of the joy I take in upgrading the mechanical parts. Anyways I had my 2011 Camaro SS with the 6.2l auto and E38 ECM tuned last year by a local shop here in hamilton and now that I have the materials I need to look into my car I see that he only turned off the codes for my o2s so my for my headers and shut of the AFM but didnt touch any tables. I did a comparison with a stock file I downloaded and the tables are stock. Since he "tuned" my car though it is running rich (I can smell the fuel) and I get a random "flutter"in the engine only once when I am sitting say at a stop light, idling, and it seems completely random. Sometimes it happens and sometimes it doesnt. So I have attavhed the ECM file and a log of a drive I took that I happened to catch it on. The short term and long term fuel trims seem to pause before and during this time and the AFR goes from 14.68 down to 12.44, up to 15.96 and back to stoich all within about 5 seconds and I can hear the engine going through this. I am worried the When my Wideband comes in tomorrow and I set everything up to adjust my VVE, that if this happens it will hit a point, even for a a couple seconds, that is too lean or something else. Does anyone know or can you see what is going on here? I really appreciate the help and am enjoying the slow process of learning to do this stuff. Was just hoping not see see something weird like this before I go and follow the tutorials to do my first tune on my car. Also on a side note, can I follow the tutorial for idle tuning an ls1 that is pretty popular in these forums for my l99/ls3, is it pretty much the same process. Thanks guys, this is my first post and I hope it doesnt make me look dumb lol.