car will not idle

[armbarallday]

ok here is the deal I had my engine built. here is a mod list so it may be easier to identify the issue. It's an 05 lgt

1.5 xtr

tgv delete

id 1050x top feed injectors

walbro 255 fuel pump

weisco pistons stock bore

manly rods

new stock crankshaft

all new bearings

valves and springs

bigger cams

adjustable fuel pressure regulator

external wastegate with dump tube

adjustable wastegate bracket

map performance equal length header

sti oil pump

killer bee oil pickup

aluminati fuel rails

04 sti 6 speed swap with rear diff

dccd pro

I think that covers it, now here is my issue the car starts but only runs with my foot on the throttle. there is white smoke coming out of the tail pipes. when I did the injector conversion I noticed that there were 2 plug connections on both sides of the engine where the fuel rails are that no longer seem to have a home? is this a thing or am I missing something? when the car is running, it runs shitty. I have the fuel pressure set to 46 psi. I have a base map written by my tuner who built the engine on my v3 and its loaded into the car. I am not sure if it can be a vac issue or if its a fuel issue. Any input will help. Thank you in advance

[200kSpecB]

is there a CEL and are there any codes?

[armbarallday]

is there a CEL and are there any codes?

 

No codes

[MilesA]

You can put a vacuum gauge on it, that should rule out vacuum leak and give you some more info to go on.

 

Intake Manifold Vacuum

INSPECTION

1) Remove the collector cover.

2) Idle the engine.

3) Disconnect the brake vacuum hose from intake manifold, and then install the vacuum gauge.

4) Keep the engine at idle speed and read the vacuum gauge indication. By observing the gauge needle movement, internal condition of the engine can be diagnosed as described below.

 

Vacuum pressure (at idling, A/C “OFF”):

60.0 kPa (450 mmHg, 17.72 inHg) or less

 

 

Diagnosis of engine condition by measurement of intake manifold vacuum

Vacuum gauge indication = Possible engine condition

 

1. Needle motion is steady but lower than normal position. This

tendency becomes more evident as engine temperature rises.

 

= Leakage around intake manifold gasket, or disconnected or

damaged vacuum hose

 

2. Needle intermittently drops to the lower position than normal.

 

= Leakage around cylinder

 

3. Needle drops suddenly and intermittently from normal position.

 

= Sticky valve

 

4. When engine speed is gradually increased, needle begins to vibrate rapidly at certain speed, and then vibration increases as engine speed increases.

 

= Weak or broken valve springs

 

5. Needle vibrates above and below normal position in narrow range.

 

= Defective ignition system or throttle chamber idle adjustment