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If you can plug in scan tool and check to see what coolant temp your ecu is reading. If not then check fsm how to manually test coolant temp sensor and wiring from sens to ecu.
Check coils for damage, burnt surface/cracks/ etc..
Look at spark plugs, sounds like your running rich and see if all 4 are wet or just 1...
Fuel pressure check...
There is more to it, these are just some basic tests you should do.
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