I have a 2002 t/a with:
408 lsx
6 bolt tfs 235's
235/231 621/617 115
twin turbo tc 72's
4l80e w/transbrake segmented in by hptuners (car was originally a m6)
dana60
I have a startup tune (sd tune) 3 bar map that I had my tuner email me to get started to at least get some break in miles on it before I took it down to have it dyno tuned. I am breaking it on off boost of course and keeping the rpms below 3500. I have a problem with the car upon initial startup each day. Same tune nothing changed. It takes me about 30 minutes at least to get the car to run and keep idling before I can even take it out. The car surges and cannot keep an idle and dies after idling for a couple of minutes. Once I let the car sit and idle and restart it several times it eventually snaps out of it and runs and can restart if I shut it off. I have some stumbling while driving but I figured that is to be expected since it's just a startup tune that hasn't been logged or fine tuned. Problem is my tuner is in Colorado and I'm in Wyoming so I can't just take it down there until it's broken in. I have a log of it while it's having the idling issues. Someone please help with this issue. I can't even get out of the driveway at this point. I couldn't get the car to settle out even after fiddling with it for an hour today. I'll be checking/changing the spark plugs to eliminate that possible issue since it is the first set of plugs used since we first started tuning. Thank you for your time and information/experience. Chris