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Ask Dave Nova Your Own Question
Dave Nova
Dave Nova, Buick Technician
Category: Buick
Satisfied Customers: 1808
Experience:  ASE Master Certification. GM World Class Certification
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I was driving and it started sputtering and shaking with

Customer Question

I was driving and it started sputtering and shaking with hardly any response to acceleration. Auto zone ran text and said evap and misfire on 4 and 6. We changed evap and all spark plugs. It's no longer making the noise and idles better but when trying to give it gas to go up a hill or increase speed the rpm's run up and there is little if any acceleration until going down hill. There is also a constant humming when running even parked that almost sounds like the noise made when your out of power steering fluid.
JA: When was the fluid last checked? Have you heard any whining noises while turning the wheel?
Customer: I have checked the power steering so that doesn't appear to be the issue. Just best example I know to use to describe the noise made when the car is on
JA: What is the model/year of your Buick?
Customer: 2009 Buick Enclave cxl
JA: Are you fixing your Enclave yourself? What have you tried so far?
Customer: We have replaced the evap and all spark plugs
JA: Anything else you want the mechanic to know before I connect you?
Customer: I can't think of anything else
Submitted: 9 months ago.
Category: Buick
Expert:  john aka eauto replied 9 months ago.

how is the trans fluid? any trans codes?

Customer: replied 9 months ago.
Transmission fluid is fine and no trans code
Customer: replied 9 months ago.
Came up evap which we replaced and misfire on 4 and 6. Improved slightly after evap and we replaced ALL spark plugs
Customer: replied 9 months ago.
Now it's not chugging while idling but has no power and rpm's run up when trying to accelerate
Customer: replied 9 months ago.
makes a humming noise while on
Customer: replied 9 months ago.
I've heard everything from coil pack to fuel injection issues
Customer: replied 9 months ago.
But computer says misfire on 4 and 6
Customer: replied 9 months ago.
Is this still being looked at?
Expert:  john aka eauto replied 9 months ago.

rpms run up like a trans slipping?