Engine Performance problem
1993 Oldsmobile Ciera 6 cyl Front Wheel Drive Automatic 75000 miles

I HAVE A 93 OLDS CIERA WITH A 3.3 ENGINE. WHEN COLD YOU START IT UP AND TRY TO DRIVE AWAY IT SPITERS AND SPUTTERS ONCE YOU GET GOING IT SEEMS FINE. IT WILL CONTINUE TO DO THIS EVERY TIME YOU STOP AND GO AGAIN. ONCE THE CAR IS HOT IT SEEMS TO GO AWAY STILL THERE A LITTLE BUT 95%BETTER. I PULLED THE CODES AND GOT LOW VOLTAGE TO THE TPS. I CHANGE THE IAC AND THE TPS AND THE ALTERNATOR (THE ALTERNATOR WAS BAD) I ALSO CHANGE THE PLUGS AND WIRES. FUEL PUMP READING IS AROUND 36LBS AT IDOL 40LBS WITH A LOAD. THERE DOES NOT APPEAR TO BE ANY VACUUM LEAKS EITHER. ANY THOUGHTS? THANKS