Engine wont stay running

[shmiet]

Im having issues keeping my engine running. It will start up fine but run for maybe 5 to 10 seconds. Im thinking its the injector pulses. I checked the hot side and its getting 12v. I checked between both leads and im getting 5.5v. I also checked the negative lead and positive from the battery and i get 12v. Any thoughts? Could it be a fryed pcm?(vats is tuned out)
Any other possible reasons it wont stay running?
I made a common ground for the harness on the driver side head by the ect sensor and from there grounded to the chassis. Do you think I need more grounds? Could that cause the issue im having?
Any help would be greatly appreciated

[BIG BLOCK 555]

check your fuel lines , also how many ground wire on your car ?

[shmiet]

Fuel lines have 60 psi. I have one ground from engine to frame and a few directly to the frame and some to the driver side head.

[farmtruc]

Any codes? The Maf ?

[shmiet]

Maf is deleted. Ya MIL is on but i dont have a code reader. Ill see if i can borrow my buddies then post what codes are thrown later tonight.

[farmtruc]

what about the air intake temp sensor?

maf can be somewhat disabled in the tune but not permanently deleted; in order to revert to sd mode.