[NeighborsComplaint]

Just trying to be logical here. Did the engine builder provide you a complete running engine with a guarantee? Did he install the motor and give you back a running car? In either case, if the work was performed recently, take it back to him and him and let him resolve the problems.

If an excessive amount of time has passed since it was rebuilt, or it was a motor/no accessories build, you are stuck trouble shooting it yourself.