I'm not using a hp tuner and wish I was but I didn't know about it at the time I bought my first tuner. I'm running a L31 350 with a built tranny and rebuilt rear end with 373 gears under a 99 chevy burb. I'm using the jet dst tuner and know its got some different named tables but its basically the same. I want to know if the setting under fuel parameters labeled power enrichment rate period should be set higher than factory 0.00 sec, i'm going to try and post a pic of what i'm looking at on my screen. have some other answers needed as well. thanks in advance, Neil.IMG_155372669152F.jpgIMG_155372669152F.jpg