Yep, Check Oil Regularly; Problem Now is Random/Multiple Cylinder Misfires on 2, 3, and 4

[I've included a PDF version of this post if you find it more readable; please see attachments]

I've read poor quality/old spark plugs, bad fuel, ignition wires, etc are all potential sources of cylinder misfires. Before running out to replace things with no method to my madness, I'm hoping to get some guidance on the highest probability cause(s) at lowest cost and start from there. Recommendations on particular brands (or ones to avoid) as also much appreciated.

I sat in the car, at 2006 Prius with unknown mileage on the engine for 15-20 minutes with the car intermittently idling and there were no problems. Also, kept foot on accelerator to keep it humming around 2,000 RPM and everything was fine. On other hand, the engine sounded awful after putting the car reverse and then pulling forward into the parking space.

Not sure if this rules out bad fuel as the source of the problem, but thought information worth passing along.

Techstream generates the following codes: P0300, P0302, P0303, P0304, C1241, B1421 and B1271.

Below I've provided additional data from Techstream that may be helpful. Thank you in advance for any help you can offer.

ENGINE AND ECT LIVE:



P0300


P0302

CONTINUED
​

CONTINUED
​

Can anyone tell from the data below if the 12V battery needs to be replaced? I read elsewhere in these reports it shows BM Voltage at 13.9 (is that the hybrid?)



Thank you, particularly if you made it this far through the post! I really appreciate it.

Life's given me a swift kick in the balls and I really appreciate any help you can offer. House and all personal belongings destroyed by fire Feb. 8, 2015; Had to fight USAA insurance company for almost four years to get personal property benefits (still haven't received all home benefits); loan mortgage servicer, LoanCare, who holds *more* money in an escrow account from insurance loss proceeds than I owe on the mortgage - is wrongfully withholding money to rebuild our home despite sending over 2,500 pages of requested documentation (contractor invoices, lien waivers, etc,), - so house still not rebuilt.

Now LoanCare is trying to foreclose on our "lot" - even though they technically can't since they already have more than enough money to pay off the mortgage with escrow funds, since I stopped payments; Paid over $120K to rent a cockroach-infested apartment so cramped our two teenage daughters share a bed and, adding insult to injury, I paid over $50K in mortgage interest over past five years for money I'm not borrowing since the loan servicers not releasing funds for rebuild.

Oh, and getting back to the Prius, the mechanic who replaced the engine this summer after I failed to check the oil regularly (every 5,000 miles is a bad rule of thumb, especially for older vehicles) installed an engine without a VIN or serial, which is illegal in Georgia, and means it's likely stolen. I've contacted the police and they aren't doing anything about it. So

Apologies for the rant...