I'd check coil packs are working properly first, then start pulling plugs to check all are firing, also worth running the engine in the dark and looking to see if you can see a spark plug lead arcing.
Also worth checking the vacuum hose to the MAP sensor isn't split and unplugging it to see if it affects anything for better or worse.
If all seems fine on the spark system and the MAP seems to be doing something, then i'd say it's quite possibly the blue coolant temp sensor in the inlet
I've had one fail so badly on an SPI it started spitting fuel out the exhaust even with a perfect spark system.
