hey guys i'm all the way from australia,my question is how do i tell via the dash what is causing my car to run rich i'm currently using efilive v4 on my 1994 holden vr calais running a n/a series2 buick 3800 v6.the thing keeps missing,backfiring, running rich it doesn't throw any error codes either i'm thinking a vacuum leak but just want to see if i can confirm it with efilive as i've been trying to fix it for the last 3 weeks with no luck an i'm about to burn the damn car...any way here's a screen dump of the car at idle



can i do something similar to this?
"Plug your scan tool into the diagnostic connector and start the engine, then look at the Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT) values. Normal range is typically plus or minus 8. If the numbers are +10 or higher for STFT and LTFT, the engine is running LEAN."
http://www.aa1car.com/library/problem_hesitation.htm