It can get frustrating I know.
I have been in the same boat since the header install.
Put LTs in and get the same ET and trap speed as before LTs.
The only bright spot, if you can call it that, is I started having a stumbling problem that was not very pronounced, last nite it got really bad really quick and even was backfiring slightly under acceleration.
I call this a bright spot cause at least now I have some hope of why I did not gain anything with the LTs and how to fix it.
As we speak the front of my engine is torn down and a new opti is going in, I am putting a new ICM and coil in as well cause I obviously have a spark problem and I want it to go away for good.
I did alot of other stuff trying to figure out where my power went as the car held good fuel pressure and ran fine for awhile after the LT install.
The opti was slowly going the whole time and was holding me back.

At least I am hoping like hell that was it.

 

Man..... And I thought mine was a little slow with just a Hot Cam... Wheelman..... I wanna see the car to see if I can help you figure out what the issues are. We should meet somewhere since your in the Chicago area..... LMK. Also I may know someone that can look at your tune for you, but your gonna have to drive quite a ways....
Also did you get my e-mail?

 

got ur mail, thanx

sent one back

 

I know that the dyno one really tell what is wrong with his car. But i had sort of the same problem as he did with my mustang. It didn't really feel like it was shifting right in the high rpms. When i strapped it on the dyno it showed the power sort of lvl out and decrease for a second or 2 while it was shifting. So that is why i think it would help to get it on the dyno to see if his does simular things.