1997 Toyota Camry 4 cyl., When driving it stalls after the engine gets warm. Also when driving it feels like it is cutting out. At stoplights it will die unless you put in Neutral and idle it up to about 2000 rpms. We put a used throttle body with IAC valve but made no difference. We had the check engine light read. The codes where: P0446, P0505, P0402, P0401.

Head gasket is leaking antifreeze into the cylinders but it is very minor now, soon you wont be able to drive.

Probability 1) The thermostat is probably stuck open, coolant is not getting hot enough from the engine to provide heat.

Starting from cold, allow the engine to run and warm up. While doing this, feel the upper radiator hose - you should be able to feel the coolant heating up to the point the hose is uncomfortably hot. If it gets that hot, then go to next step.

Probability 2) The heater core flow is restricted, not allowing full flow of coolant into passenger compartment.

There are 2 smaller heater hoses that run to the firewall. Are either of these hoses getting hot? Both sides hot indicate full coolant flow. Both sides cool indicate heater control valve not opening fully.

The cooling fan is controlled by a temp switch in the bottom of the radiator, try6 replacing this switch.

try disconnecting the hose to the brake booster and plugging it, the take it for a drive, ( you won't have power brakes so do this in a empty area)

bro u have to check all the fuse.it is located on driver side,on right side.

its the temp sensor it helps control the fueling and run it too rich till it floods and cuts out

Possible EGR valve sticking open.

its in the kik down cable its sticking

I need to get a clear mental picture of what exactly is happening.

With this said, you stated that the car "runs fine" until warmed up.

Q: When you start the car when cold it idles fine?
Q: If you allow the car to idle until "fully" warmed does the car stall?
Q: As the car begins to warm up, Does the RPM fluctuate abnormally?
Q: Does the car Only stall when you press on the gas pedal or does it stall just sitting and idling in addition to pressing the gas pedal?
Q: If you can drive it while cold does the car stall during acceleration when warm or only at Stop Signs / Lights?
Q: If you wait 20min or so, can you start the car again?
Q: How many miles are on the car?

Check vehicle for possible vacume leaks, hoses off etc.