seto kaiba

I have a 1986 fc it runs good while its in motion and out streachin its legs on the highway , but when i come to an idle it will idle realy low almost to the point
of killing it. and if i turn it off and go to start it the next morning it will have a hard time starting unless i hold the gas petal to the floor, in not shure whats givin me the problem i have replacedthe following ,
throtal syncer,
all 4 fuel injectors,
fuel pump,
fuel filter,
fuel presure regulator valve,
not shure what else could be causeiong it need help , if you can let me know the possible part and where i might be able to locate one , or if some thin is just in need of adjusting thank you all for your time .

TiGeRC|aw

when's the last time you cleaned your bypass air control valve?

does it start fine in first gear, aka bypassing the warm up process?

seto kaiba

bypass air control valve? where is it located and how do i clean it? i dont think it has been done since the car was built , i always start it in neutral i havent tryed starting it in first gear will it make a difference? also with this car i can start it with out pushing in on the clutch is that good or bad? i know most cars have to have the clutch pushed in to start it. again any help is apreciated guys thank you for your time