1990 Nissan 240SX won't star when worm

Engine Mechanical problem
1990 Nissan 240SX 4 cyl Two Wheel Drive Manual? Miles

ok I have a nissan 240sx, and I have this problem that in the morning when I start the car it don't show no problems, but later on the same day when I start the car again it takes time to turn feels like there is no gas going to the injectors, becasue the car will start if I push the gas all the way in and idle is slow. What it my be the problem?