Hi. Need help on a misfire. 2003, 136k miles, original battery. Getting a rough misfiring on a warm engine. P0304 and P0303, kinda alternates between the two, 04 recorded then 03 live, then back. New-ish (<10k, OEM) coils, plugs. Swapping doesn't show anything. Compression test fine. No signs or smells, etc of coolant leaks. Never need to add any fluids. MAF/throttle body done a couple years ago. Techron run through 6 months ago. I've had it for about 4 years. I know the original owners so it was treated well. Note, I have a P1437 from a stolen cat that's been there for ~6 months. Misfire just started ~2 weeks ago, mild shimmy ("did I just feel something") then on a road trip 30-35 miles in came on for real. Limped to a mechanic I knew, not a Prius whisperer, tho. He's stumped. Injectors? Trying a swap or test. Vacuum leaks, manifold or lines... TIA.
