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Ask Gm Tech (Cam) Your Own Question
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1667
Experience:  GM Grand Master Technician 2007. 14 year experience.
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My 1999 GMC Suburban turns over but won't start. But some

Customer Question

My 1999 GMC Suburban turns over but won't start. But some times it starts right up. When it does it has plenty of power but idles rough. It has 256.000 miles on it and is good shape. It was tuned up two years ago. Plugs, wires, cap and router, gas filter,
JA: Is the rough idle intermittent or consistent?
Customer: At first it was intermittent. Now its consistent
JA: What is the make/model of your car?
Customer: 1999 gmc Suburban 4x4 5.7L
JA: Are you fixing your Suburban yourself? What have you tried so far?
Customer: Yes I've replaced the ignition control modal and the coil GM parts
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 1 month ago.
Category: GMC
Expert:  Amedee replied 1 month ago.

Hello and welcome!

My name is ***** ***** I can assist you with your question.

Expert:  Amedee replied 1 month ago.

Are there any codes in the computer?

Are you looking for possible causes?

Customer: replied 1 month ago.
multiple misfires
Expert:  Amedee replied 1 month ago.

Thank you for that information.

Has the fuel pressure been checked?

If so, what is the fuel pressure at when this occurs?