Does anyone else have the Factory Service Manual for a 1997 Camry V6?
Please look on page DI-213, the trouble codes. It looks like--if you read left to right-- that trouble code P0306 refers to cylinder #5 (as do all the other cylinders look 'off'). Just making sure I'm reading this right, because at face value someone would be digging into cylinder 5 on a P0306...and I'm not about to dig into my cylinder #5 issues unless I absolutely have to b/c it's a pia to get to.

 

DI-213 implies cylinder 5, but DI-276 shows it to be cylinder 6.

Typically the last number of the code is the cylinder no.