I drive a 2002 Camaro Z28. It has an automatic tranny 4L60E. I was getting on the highway and at this moment i was in Drive not Overdrive. So i got on it a bit and hit 125-130 at least. But when I did that I was in drive a little too long and it kind of fell on its *** a bit then i shifted and it still accelerated. Then I slowed down to speed limit. Then when i was close to home there was enough traffic so i sped around them and this time i was in overdrive when I got on it. When accelerating I didn't want to get over 95. It responded nicely from 70 to 94 then at 95 it just bogged down a bit. I don't know if this could be fuel problem? Back pressure problem? Cat problem? What could this be? First time this has happened to me so kind of new to this situation.

 

What rear axle ratio do you have? Is the engine or the PCM program modified in any way?