Car starts good when cold, won't budge when hot.

What is your question?

New ignition has been put in. Battery tested good. Starter tested good. So frustrating. Car starts in the morning, but won't in afternoon. Sometimes there is a small grumble, mostly nothing clicks. I go back in the cool of the evening and it will start. Same thing over and over. Its been getting worse lately. Started for me fine at 10:30 a.m. At 3 p.m. ABSOLUTELY would not start. Some times rocking helped. Next time does not. I go back later and it will start.