my 1993 camry 4cyl also had problem after driving on highway, need to keep the foot on gas pedal to keep the engine running, i thought it was the throttle body, but not.
and the problem getting worst everyday.
initially if it stalls, i can restart it right away and keep going
but a few weeks later, when it stalls, it won't start up until it has been cooled down
turn out it was the engine coolant temperature sensor malfunction, keep flooding the engine with gas when the engine has reached proper temperature.
if you take it to some mechanic, who is not familiar with this issue, they can blindly swap other suspected and expensive parts at your cost.
and the problem getting worst everyday.
initially if it stalls, i can restart it right away and keep going
but a few weeks later, when it stalls, it won't start up until it has been cooled down
turn out it was the engine coolant temperature sensor malfunction, keep flooding the engine with gas when the engine has reached proper temperature.
if you take it to some mechanic, who is not familiar with this issue, they can blindly swap other suspected and expensive parts at your cost.