97 trans am only leaks coolant out overflow
I replaced the water pump drive seal because of a oil leak so I put a new water pump and thermostat in it. So I filled it up once back together with antifreeze. Ever since then when I get into the throttle then I park it I have a puddle of antifreeze under my car. Only happens when I get into the throttle though. I've tried pressure testing and it shoots coolant out the top of the radiotor, I've use three different testers. So my question is where is the best place to go from here? Where to look? What I can do? Stuck at selling it, or trying to find the problem.