ok here's the history:

1st setup:
hotcam, shorty headers, catback, stock cat, stock tb
- got it tuned by pcmforless, ran great!

2nd upgrade:
still hotcam, 1.6rr, longtubes, no cats, true duals, 52mm tb
- ran the old tune(above), runs strong but pops/backfires when WOT. Drives normal except WOT.

Just got my new tune for the new mods and i can't even drive the car down the road.. It's been double checked by pcmforless, and emailed to me twice. i've loaded it 3 times with no driveable success. it dies, shutters, shakes and has no power.

I'm running the old tune right now to be able to drive the car. PCMforless said i have something mechanically wrong?

Here is a vid with the new tune: http://lt1engine.com/problem.mpg

I've replaced virtually every singe sensor with about 3-4 months run time on them. (02's,knock,water temp,pcv,new plugs,wires,opti). I am running the original tps, iac, iat, map and evap.

 

rockers too tight??? that would cause a loss of power and backfiring. although i dont think that answers the only at wot problem.

 

car runs perfect on the old tune except for wot. btw i'm not throwing any engine service codes.

I forgot to mention. The car is drivable witht he new tune when it's cold, but it has no power and it wont downshift to wot. when it's warm, that what it does in the video.

 

I'm going to go pull the valve covers, and check the o2's. any other suggestions? what about the maf?

 

If you have Tunercat, try doing a compare between the two tunes and see what's different.

 

i dont have it, and i wouldn't know what i was looking at. i have both files tho. Can anyone here help me out?