08 XB Code P0351

[wej]

Every week or two my Xb check engine and VSC warning lights will come on, it gernerally goes back off within a day. I took it to Advance this morning when it came on and the code was P0351. I've done some research but cannot come up with a solid next step to take. Has anyone dealt with this issue yet and know what is the most likely problem? Coil, ECM, etc?
During my research i did find the following TSB.
T-SB-0047-10</SPAN>
MIL "ON" DTC P0351, P0352, P0353, P0354, P0355, P0356 (T-SB-0047-10)</SPAN>
Some 2008 – 2010 model year vehicles equipped with 2GR-FE engines may exhibit a MIL “ON” condition with Diagnostic Trouble Code (DTC) P0351, P0352, P0353, P0354, P0355, or P0356 (Ignition Coil Primary/Secondary Circuit) stored in the Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM).

[HATEnFATE]

You prob have an ignition coil starting to fail.

The fun part is finding which one if it's intermittant. Keep an eye out for a misfire code.

TSB# S-SB-0028-09

Some 2008–2009 model year xB vehicles may exhibit a M.I.L. “ON” condition with Diagnostic Trouble
Codes (DTCs) P0351, P0352, P0353 and/or P0354 (Ignition Coil Primary/Secondary Circuit)
stored in the Engine Control Module/ECM (SAE term: Power Control Module/PCM). The ignition
coil assembly has been improved to address this condition. Use the following repair procedure to
address customer concerns.

[wej]

I believe you may be right, and I've found no hints online as to how to easily check each one.

[HATEnFATE]

You'll need to check your codes and look for a cylinder misfire.