MX-3 92 V6 won't start when engine is hot

[Valentino Martis]

When I Start my Mazda MX-3 there is no problem ,but when the car engine become hot when riding and when
turn of my Car..and try to put it on back.it won't start.I have to open my car hood and take the two plugs
that goes to de injecters and try to turn the car on and then put the plugs in back and then will the car turn on
back..I don't know if I have to buy a new ECU or what? PLease Help....Every time I go out I have this problem
and it is embarissing. (Sorry for the bad English)