Need some help with my '70...

[wldcat10]

How's it goin' everyone? Recently my '70 has been acting up and want to see if anybody has some input on what you think it could be?

This started up just recently. I would only take my truck out on the weekend to cruise around a bit. I ended up buying it a new battery as the other died on me. I can go into garage and crank up the truck no problem. Starts like a champ, cold start. If I drive a few miles down the road to gas up or to run an errand I turn off truck and when I go to start it up again, it gives me trouble. Almost like the battery is running out of juice or something? Very slow to start. The battery is new though, which has me wondering what it is?

Seems like it only does this when the truck is warmed up after driving a few miles. Any ideas on what it could be? Any info/advice is greatly appreciated!