It seems when I get above 4500 rpms in top of 2nd or when it goes into 3rd, where the rpms will go up like 4550 then back down to 4505 then up to 4590 and then up a bit then back down a few rpms throughout the pull. My graph looks like it hits a dead spot and barely goes up but I don't feel anything awkward in the car. Any clues what might be going on to cause this? I have a feeling my converter is not doing so great, but I don't think it explains what's going on. I think I'm losing 2-4 mph in the 1/4 when it does this instead of pulling constantly throughout.
I have some scans to show this, and would like to see what you all thought.
This is on a 3.8L Series II Supercharged and 4t65ehd tranny.
Thanks,
Amir