Problem starting when engine is hot

My 1996 Toyota forerunner starts fine when the engine is cold and it runs fine but when the engine is warmed up and I shut the engine off it won’t start back up until it cools back down I changed the coil packs and spark plugs and the only code that’s coming up is the O2 sensor I doubt that’s what’s causing it any suggestions I was thinking about changing the coolant temperature sensor

 

My 96 with the 2.7l will crank with no start when the maf sensor gets dirty. I just spray it off with maf sensor cleaner and starts right up. It mainly only does this during the summer. I clean it once a year. Hope this helps.

 

My Son's 2000 4Runner V6 is getting hard to start and runs sluggish. Anybody know where the fuel filter is located. He has 230,000 miles on it and the filter has never been changed.

 

Fuel filter is just in front of the fuel tank in the gas line