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Discussion Starter #1
Yes I’ve search everywhere for this nothing too helpful.
So I clean out the injector
Switch out the injector
Switch out the coil pack
Switch the wiring harness for coil pack
New spark splug and wires
Clean out the maf
I did a compression test and number 4,2,7 are all same compression which is 165.
ive spray around manifold too find air leaking or see idle changed. Didn’t happen.
anyone could chime in please
 

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2006 CTS-V
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I've found with my car the spray and pray around the intake doesn't work at all. Look at your fuel trims and you can spot a vacuum leak.

Have you pulled the valve cover to look and see if something mechanically is wrong?

-Byron
 

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Discussion Starter #3
I have actually. I’ve turn the engine to see if any push rod broken or spring. Everything looks great
 
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