Engine no power like it’s not getting enough fuel to run right then after you run it a while something happens and it runs good, then after you shut it off it will do the samething again

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your C1500. It sounds like you're dealing with an intermittent issue that could be related to several different things. Since you've already replaced the MAP sensor and checked for vacuum leaks, I recommend confirming you're getting the correct readings from other sensors, such as O2 and the coolant temperature sensors. Faulty sensors can lead to the incorrect fuel mixture reaching the combustion chamber. It is also worth inspecting the ignition module for a failure that corrects itself as the engine warms up. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!