Porsche 944/951 turbo acceleration slow

[fsporsche]

Hi, everyone...

If anyone can help me with this much appreciated....I have had my Porsche 944/951 turbo for 6 years and i have never had any issues with power loss.
This is what happened, the last 2 weeks i got a oil change and went to a no thrills gas station and filled up. A few days later i noticed as i am going from 1st manual gear it is sluggish taking off, second gear the same and so fourth. But when i am on the parkway even though it take me a while to climb up to 60 mph it stays fine when i am driving. Its only when i stop and start from 1st to 5th i dont take off right away, its slow and finally gets there...Can this be transmission issue?
Please help, not sure what to do....

can this be the fuel relay or computer relay that is causing this?
Also what about the cat being clogged?


I have also tried fuel injector cleaner and new sunoco ultra fill up but still the same.


Fred