My engine takes few seconds to rev when pushing gas pedal when warm, why?

What is your question?

When I start the engine it runs fine at first while cool. If you shut if off after running it for 10-15 minutes, the dash lights come on and off, the gauges work and stop working, and when you push the gas pedal it takes it a few seconds to rev up and when it does it only goes to half rev? I blew the engine in the car after I bought it and have recently put another engine in it. Checked over compression, fuel pressure, sensors, wires all connected, grounds were cleaned up before being put on, checked exhaust. I'm exhausted trying to figure out why it will start and run say first start in the am but I haven't driven it anywhere due to if I shut it off when it's warm, I restart it and it's all f***Ed.....help me please