Gator 825i rough idle at first start of the day

Hello im new here.

I have a gator when i fisrt start it ( not at normal operating temp) the engine start but idle rough at 800-700-600 for maybe 30 sec and die. If i restart it and tap the gaz pedal to givr some rpm for couple seconde it will idle fine at 950-1000 rpm

I have chek fuel pressure ok 50psi
All the injector have been tested no one are leaking and all 3 are spraying the same amount of gaz

I have try a trottle body of another gator and its not the problem

I have ordered a coolant temp sensor i will try it tomorrow.