help for tomorrows work with the mustang!

[stangbang302]

alright so i just built my coupe. i put everything together and started it up. well it just dies instantly unless i can keep it revved up. until it warms up a little it will idle just fine. there is a big surge going on until it warms up. so tomorrow all i really established to do is clean the iac and see if that helps with the idle. what do you guys think i should do? btw there are not any vacuum leaks.

 

[2BADSTANGS]

What setup you running motor wise?

 

[stangbang302]

its a pretty mild set up, gt40 heads, cobra upper and lower intake with a 1in spacer, e303 cam, 70mm tb, 73mm mass air, stock distributor except msd cap and rotor, 19lb summit injectors. the motor ran perfect when i had it in my hatch

 

[beyondspexj]

iac dirty or needs to be adjusted? mine does the same ( stock 302 ) and im assuming thats what needs to be cleaned and/or replaced since i have no vac leaks. I cleaned mine out and now its only every so often, instead of holding the throttle open for a few seconds, i just have to blip it when it dips once after start up and it holds itself. but i think mine is idling to high as well ( about 900-1000rpms )

 

[stangbang302]

did you check the tps?

 

[HISSIN50]

Is the base idle set correctly?
Will it idle without the IAC connected on a hot motor?

You mentioned surging. Does it do this while holding the throttle perfectly steady? I'd want to check for vacuum leaks again.

 

[stangbang302]

yep i can hold it steady and it would rise up quite a bit.

 

[apollo12]

Do you have fresh gas in the tank?

 

[stangbang302]

yep, put about 2 gallons in before starting it up

 

[apollo12]

Does the tps have a reading around .999? did you pull the dizzy out of the motor?Do you have another computer to try?

 

[7upstang91]

just a clean tune up, and more than likey a tune.