So my montero starts fine if I drive it every day, but if I let it sit for a couple days it will has trouble starting. I'll give it some gas, then let it sit for a while, and then crank it over again and give it some gas and it manages to start. Once it starts it runs and idles perfect. Has anyone had a problem like this before and what should I look at replacing?

1989 Montero LS LWB
Rear LSD, KYB's, 3.0L, Lockup A/T, 2" BL, T-Bar Crank, 33" MTZ's, Full Length Roof Rack, 9k Winch with custom bumper, Rock Sliderz