Ok so if.made a few post about my 87 iroc and running crap issue.So most new.parts thrown in just bought a new set.of Delhi injectors from south bay injectors .Thanks to them.So but everything back togeather and it seems it finally is idling good.Then my light bulb came on and inrealized i forgot to plug in the fuel pressure reg yikes.So went out side reattached vacuum line to plenum start it up and dammm same crap idling.Unpluggg vacumm line and it runs like like did before surges up and down ect.Wtf is going on.

 

What code is it throwing? What is your fuel pressure with the vacuum line connected and disconnected?

 

No codes and when I tested connected it was 43 and holding .Never tested vaccumm unplugged.

 

What is your fuel pressure?

 

it's 43 psi and holding during testing

 

Does it run better with vacuum line disconnected but plugged? (Higher fp, just no vacuum leak)
give a rundown of your symptoms again please

 

Despite being delphis sounds like you need a afpr or a tune . It sounds lean if surging.
what is Blm/int at idle ?

 

runs smoother with reg not plugged in .As soon as you plug it in to vacumm it's a it it show

 

The ECM has an integrator to SLOWLY write the updated to the BLM. Since it was started with the FPR in "bypass" mode, it may be worthwhile to disconnect the ECM power to clear everything and let it re-learn with everything connected correctly.

 

Can this be accomplished by disconnection the battery?

 

One method is to disconnect the battery. If you have a radio with presets and would rather avoid setting that up again, another method would be to remove the 20A inline ECM/FP fuse located near the battery. As long as the ignition is off, pulling that fuse should remove any ECM backup power.

 

Well thanks for that. However the issues continues.I know understand why when i disconect the vacuum the psi on my fuel pressure tester goes up and when its plus back in it it goes down whichbtells.me the diagram inside the regular is doing its job.What i cant understand why it revs high then low.Could it be the fuel pump is crappy??

 

update just put a new fuel pump in and when the car is running the presuure is to high 80psi