I have a stock turbo on a '84 GN with 65,000 miles. I was tuning my car this weekend with my T-link and everything was fine. I woke up Monday morning and started the car, but it made a real funny mechanical clink when the motor was turning over, so I tried starting it again and it fired up fine. I started down the road and at about 35 mph the car starts stuttering like it does not want to shift. I procede to floor it thinking maybe I got some bad gas, the car hesitates then takes off like a mad dog. I have been driving this way a few days and the car drives ok as long as the rpms don't build up, once it shifts into overdrive the sputtering stops. I have noticed on occasion puffs of smoke coming from the exhaust and different whinning noises from the turbo?? It definately seems mechanical and coming from the side where the turbo is. the only tuning wise I did was increase the fuel pressure to 40 psi( with vac hose off) and play with the TPS. I did put the TPS back the way it was. The best description of the sputtering is like a car running out of gas, you press the accelerator and car does not want to go. When the car was finished being tuned on Sunday, it ran great?? I know I am looking for an excuse to buy a TA49, but it would be better if I could wait a few months. Anyone got any ideas??