It seems that on hot days my car doesn't want to start. I drive it, park it, go inside the store and when I come back to start it and it doesn't want to start. I make sure the air conditioner and radio are off and I try again and then poof it starts. But as I try to accelerate the gas pedal is not working. So I have to park it and restart it and voila, it works again and the car can accelerate. I've changed the ECT sensor, MAF sensor, check valves, and replaced hoses and I cannot solve this problem. Check engine light is not on. Any suggestions? Thanks!