SolAddiction206

i have a few issues and hoping someone can help me out.
i have a lsvtec with a stock block.

after cold start, everything runs fine and normal. runs very strong.
when the temperature hits about 2 bars above the cold mark, the exhaust will get louder and idling will start hopping from 500-1000.
when the temperature is 1 bar below halfway, the engine will seem to lose oil pressure and run like poop. throttle response is slow.

can anyone explain these symptoms?

i swapped out the iacv with 3 different ones, 3 different map sensors, and 3 different tps sensors. tb does not have a fitv.

thanks in advance