I am trouble shooting some start up issues I have.

when starting my car, sometimes I have to modulate the gas pedal to get it to catch.

my question is

does moving the throttle cause any more fuel to be used, or does it only allow more air to come into the chamber?

i didn't know if the tps sensor caused more fuel to be dumped on start up based on the throttle position.

i am trying to figure out if moving the gas pedal is adding more air, or more fuel.

Thanks for any help.

 

bump.