Engine keeps Knocking and shaking

Hi All,
The car is 2009 gen 3 prius with est. 155,000 km on it.
Oil and filter changed, throttle cleaned just less than 2000 km, I put half bottle of STP fuel injector cleaner
to the car while filling half tank to full. Nothing happen, when it's almost empty, then I filled with full tank
of gas, then ran for approx 100 km.

Then a day after, i went out to pick up something, when I was driving back home start the engine, go for about 1 km, the car start shaking and then knocking sound was heard (the car was fully warmed up). So the car was towed to home, then code scanned, nothing shown.

I have cleaned the EGR pipe, valve and cooler, cleaned all injectors, replaced new spark plugs and air filter.
Then I fire it up, no change, and It has error code this time P3190.

So the only thing that I can think of is cleaning intake manifold and throttle body.

What do you guys think ? Any experience with this issue ?

TIA.

 

Thank guys,
Will go for intake / throttle / MAF cleaning first, and finger crossed.
Hope not the blown gasket.

Thanks for the helpful info's. too.

 

Quick update, problem solved!
Was playing idle in P/D/R/N, and it finally throwing a pending misfire code on Cylinder #3.
so I swap #2/#3, and the misfire code shifted to #2.
So replace all coils as they are old anyway. problem solved.
Thank you all.