Hello and thank you in advance for any help and thank everyone on here. You can honestly build a car with a Straw, Paperclip and Elastic band with all of the Intelligent people on these forums.

Vehicle - 1988 Honda Prelude 2.0 Si
M/T

Problem:
My car seems to have a rough idle (idles up and down consistently) Massive usage of fuel and stalls when there is half a tank of gas or less and when the gas pedal is not pressed. Also when the problems begin a small whistling sound comes from what seems to be the EFI.

What could this be?

I have change the fuel pump, fuel lines, fuel filter, spark plugs, oil and filter, air filter, and had the gas tank cleaned.

Any help would be appreciated,

Thank you.