Stalling while driving

Just bought a 2000 Impala with a 3.4 V-6. Changed the Oil, Tranny Filt, Front Brakes, resoldered power button on Radio, Thermostat, and Serp Belt.

Drove it home with no issues 100+ miles, now that it is coming up to operating Temp (with new Therostat) it will die at times while driving down the road. Have to pull over pull the key out, put it back in in order to get it to restart.

Hav'nt replaced Fuel filter yet, or air filt. But if I keep slight pressure on the gas pedal it wont stall. Could it be the TPS?

I Had The Same Problem. Its Common To Need The Fuel Pressure Regulator. Its Located On The Top Of The Engine At The Fuel Rail. You Need Good (large) Wrenches To Install. This Fixed Mine And Has Worked Perfect For A Year.