i'm at a stump in the road, gents. i'm working w/ two tunes right now, trying to iron out driveability w/ a little performance. these two tunes (which are based off a j4j1) are the same except for the injector timing table values (as pictured below). for clarification purposes, "tune 1" is the yellow lines across (some cells are not highlighted) and is wrapped in red rectangles, and "tune 2" is the rows that aren't highlighted, each w/ their respective load values @ the different rpms. here's what i'm trying to figure out: - w/ tune 1, there's more grunt in performance--trouble is, the idle is crap--surges and can't seem to find a place to settle. - w/ tune 2, the idle is solid! but there is a bad backfire (sounds like it's coming from the intake mani) when revving and poor throttle response. please help me clarify one thing first: the stock j4j1 values are "300" all across and down the table. now, the "300" is in degrees?? and decreasing/increasing the "300" does what exactly? only thing i can see *really* different between the two tunes is the upper-right corner of the table vales... those are significantly different in relation to the rest of the comparison. i guess that makes sense of the backfire/poor throttle response w/ tune2, but how does that make for a crappy idle w/ tune1? what should i try to find a healthy medium between the two w/out having to datalog (don't have access to the r/t right now, unfortunately, but for the datalogs these tunes are based off of, please refer to THIS thread, post #7) to get the steady idle from tune2 and the better throttle response from tune1? it's kinda tricky in that this is the only difference between the two tunes (went through both files completely)... when i switch from one to another, the difference in idle/throttle response is almost instant.