I just put the new engine in got everything connected fluids in then took it for a drive drove for exactly 20 miles when it started to over heat then the tacometers needle dropped and then the car died anyone think they know what the problem could be? oh yah now it wont start at all just keeps tryin like there is no gas PLEASE help its my only car for work and its gettin cold out

as far as the over heating, it sounds like you didn't remove all the air from the system, or the original overheat was caused by a plugged radiator.

 

do the basic tests, make sure that you have spark and fuel, check for codes.

Lost oil pressure?What engine is it?

its an EJ18 and yah i thought the an air pocket in the coolent could have done that but how do I check codes?