CAR PROBLEMS

I HAVE A 93,PONTIAC BONNEVILLE SSE SUPERCHARGED AND IM HAVING PROBLEMS WITH IT.EVERYTIME I START THE CAR IT WILL RIDE GOOD BUT AFTER 5 MINUTES IT HAS A SLOW TAKE-OFF AND I HAVE TO PRESS THE PEDAL FURTHER TO GET MORE SPEED. IT DOESNT FEEL LIKE A SLIPPAGE WITH THE TRANS BUT ALOT OF PEOPLE SAY IT IS MY TRANS. WHAT EVER IT IS IT IS STRANGE. WHEN I TAP THE ACCERLERATER WHILE THE CAR IS IN PARK IT SEEMS LIKE THE CAR WANTS TO CUT OFF. AND IT CAUSES ALL OFF THE LIGHTS IN THE CAR TO DIM BUT THE CAR NEVER CUTS OFF AND THE LIGHTS GET BACK NORMAL.