1988 Dodge D150

I have an 1988 Dodge D150, 318 cu in, throttle body carb. I’ve replaced the fuel filter, fuel pump, plugs, distributor. However, I still have problems starting it. On cool days, it starts with no problem. When the temp outside rises, it’ll grind and grind before it starts. I just can’t figure out why the outside temp seems to have such an effect.