I just replaced motor new ko4 turbo and much more. Didn’t wanna start at first. Now it idles funny The blowout valve works great u can hear the turbo. It over heats extremely I put brand new coolant. Replaced motor. And all. When I go to take off the turbo kinda stalls and less power happens. I don’t know what it is before I changed the turbo it ran good and strong. But now it’s a little weard and idles really off Can it be the thermostat. Btw the car sat for more then a year because I was looking for a motor. Any ideas on what can it be