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rpmdiag, Tech and Instructor
Category: GM
Satisfied Customers: 7752
Experience:  Since 1975
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If it sat a while I have to spray ether to start it once it

Customer Question

If it sat a while I have to spray ether to start it once it start it fine till it sat a wile nt running
JA: Will the headlights turn on? Is the battery fully charged?
Customer: Yes battery charged
JA: What is the make/model/year of your car?
Customer: 99 gmc suburban 5.7 vortex engine
JA: What year is your GMC?
Customer: 99
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes tryna fix it myself new fuel pump new fuel filter new control module used spider injection system
JA: Anything else you think the mechanic should know?
Customer: I have spray either n throttle body to get it to start it like it loosing it's prime
Submitted: 11 months ago.
Category: GM
Expert:  rpmdiag replied 11 months ago.

Hi, welcome to Just Answer. I’m Ron and I’ll be helping you
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

You may have a large vacuum leak that is overcoming the fuel output causing the difficult starting. If you can hook up a scan tool and see what the fuel trims are doing, that would help a lot.

Thanks, Ron