Well i've noticed my car has been stuttering at part throttle lately... And it's been getting increasingly worse. Today i stomped on it in first and it popped at the shift point untill it shifted then clunked into second.. and again into drive...

I tried to recreat the scenario but it didnt do it again.
The shifts are still weak

 

what popped? Clunk?.....Maybe a tranny mount.

 

tranny mount is fine, its a poly one too

 

Make sure all tranny bolts are tightened down, then make sure that your torque arm bushing is good, you might be experiencing wheel hop. Also could be your engine mounts.