1999 Gs300 - Stalling Issues

[Reubello]

Hello Everyone - Was hoping to get a little insight on what might be the problem with my 1999 GS300 that has a problem with stalling.

I am thinking it is a TPS issue or some sort of sensor. Thank you for the help!

Problem

- Car stalls when i come to a complete stop at a stop light or standing idle.

- If the car stalls I generally have to floor the gas to get it to start again. From that point to keep it running i have to feather the gas over 1200rpm.

- When i can feel the car starting to choke, I put the car in neutural and try to give it gas. Sometimes it responds, sometimes it does not then stalls. From this point, I start back at point 2.

- When car stalls it feels like it is choking for air.

Syptoms

- Noticing a little bit of a rough idle at first start of the day

- Idle to me seems a little low

- Car runs fine when gas is being applied

- I live in Las Vegas where current temperature is usually 95-105 degrees. I notice the car tends to stall more often on hot days.

- The problem occurs only after running the car around town for an hour or two. Again, seems to happen often on hot days.

Car condition

- In good shape with - 167K miles

- Plugs and wires replaced 10K miles ago

- Fuel pressure regulator replaced 10K miles ago

- Timing belt changed 20K miles ago

- Regular maintenance completed

- Good battery and alternator