Shudder during acceleration

[Phil Payne]

> 2. Check boots for cracks.  If I understand correctly, the boot is the
> rubber(?) tube that fits over the tip of the plug.  If so, the flange on
> three of these things is cracked or broken at the end with no appreciable
> damage to the body of the boot.  I thought that might suggest a replacement,
> but the first mechanic to look at the car indicates they're performing
> normally. I can't tell you for sure how he knows this but said he checked it
> when replacing plugs.

a) Pull codes.
 
b) Check inside plug caps for signs of arcing - greyish deposit in the cap.



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