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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1685
Experience:  GM Grand Master Technician 2007. 14 year experience.
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Was running then staryed running rough idle then raw fuel

Customer Question

Was running then staryed running rough idle then raw fuel our exaust
JA: Is the rough idle intermittent or consistent?
Customer: Consistent
JA: What is the model/year of your GMC?
Customer: 99 denali
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Distribitor cap totor bun plugs and wires fuel filter fuel relay gas fuwl pump is running
JA: Anything else you think the mechanic should know?
Customer: Like its not fireing but haa spark and barely hits with starting fluid
Submitted: 11 months ago.
Category: GMC
Expert:  Jerry replied 11 months ago.

Hello and welcome. My name is ***** ***** you for visiting the site, I am reviewing your question and will reply shortly, thanks.

Expert:  Jerry replied 11 months ago.

Raw fuel out the exhaust?

5.7 vortec engine.

Very well could be the fuel pressure regulator. Do you know if the pressure holds with the key on engine off?

Customer: replied 11 months ago.
Know i dont
Expert:  Jerry replied 11 months ago.

That woud be the first thing to check, thanks