Idle stall and coast down stall LS7 E67

[69LS7VETTE]

Ok. I give up. Been trying to get car to not stall if bipping throttle or when coasting down to traffic light. I have a LS7 in a 69 vette with 6 speed. Using a GMPP harness. The origional computor would not even fire the car. Finally figured out that I needed a replacment E67 so bought a new 06 CTSV ECM. then put a basic LS7 tune in it. Have the car runing and will idle if you do not throttle up. It is running rich which I need to correct and the plan is to get on a dyno and get it tuned, but it is hard to even drive around with it dying all the time.
Here is my current tune and a current scan with idle to stop at end. If any one could take a look and get any help it would be great. I have read all the tuning trick I can find, and most pertain to LS2 or e38 ECM's. yes I am green to tuning but have basicly figured out how to get in and modify tables. read the books on basic tuning and also the basic video on tuning.

[69LS7VETTE]

Ok looks like i will have to find the cure my self. One more simple question. I have a wide band on order. Yes I knew from the start I would ned one was just wanting to get the car drivable so I could do some logging while driving. The car has been in the paint shop for almost a year. I really wanted to do a drive and log but when it stalls at every stop it becomes futile. it does have a cam so stock is not cutting it.
Do I have to put a second sensor mount in or do I replace one of the narrow band sensors with the wideband????

[neoh2ning]

sure you can unplug one of the narrowbands just remember to disable closed loop on the scanner but is easier to just weld another bung on the exhaust or get a sniffer on the tailpipe

[69LS7VETTE]

Thanks for the reply! I was figuring that was going to be the answer. Kind of hoped that I would not have to find another place to add a bung. Running side pipes with limited space to put sensors in has been a problem from the begining. But I'll find a spot down there somewhere. Thanks again.

[Sam88gta1]

The GMPP systems have a problem with corrupt pcm's. Ive seen quite a few lately.

[IDRIVEAG8GT]

So you have an LS7... That's stock I suppose? And a stock LS7 tune won't run it.... I'm rather assuming the LS7 you dropped in has a massive cam. If not then you have something wrong with your O2 relays.

If neither of those you need major MAF recalibration.

[Sam88gta1]

So you have an LS7... That's stock I suppose? And a stock LS7 tune won't run it.... I'm rather assuming the LS7 you dropped in has a massive cam. If not then you have something wrong with your O2 relays.

If neither of those you need major MAF recalibration.

It usually needs some major work on the maf tables. If you use a stock LS7 with the GMPP computer the LTFT's will max at +35%. Adding a cam only makes the problem worse.

[IDRIVEAG8GT]

It usually needs some major work on the maf tables. If you use a stock LS7 with the GMPP computer the LTFT's will max at +35%. Adding a cam only makes the problem worse.

Damn straight, the MAF in the vette is probably located in some funky position

[69LS7VETTE]

Yep, Big Cam, Head work. I bought the Engine used this way so I don't know the exact spec's on the cam. Suffice to say that the idle is rough and dies unless you keep it above 900. I am out of town right now, as soon as i get back home I'll try to run another scan and watch where the LTFT's are.
The GmPP pcm was currupt. I had to buy a 06 CTSV computer that would hook up to the GMPP harness. Got the car to run by downloading a 06 Z06 program into. Have a wideband on order should be there by the time I get home.

[IDRIVEAG8GT]

Stock LS7 tune and location of the MAF absolutely will not run a big cam LS7. I bet the LT's are whacked and needs one heck of a bump in the RAF tables.

[edcmat-l1]

A data log would help to get you dialed in. Shoot me an email and I'll try to help you out with it. [email protected]

[DSteck]

Not shocked to see the GMPP PCM be corrupt. I ran into that on a FFR GTM using a LS376/480.

[69LS7VETTE]

Thanks edcmat-l1! As soon as I get back home I'll get a data Log headed your way.