Will I have to replace my whole engine if I blew a rod?
Depends on the damage it caused and where the debris went. Most likely you will need a new engine.
Contact local auto salvage/scrap yards and see if they sell replacement engines. Some will even install them and give you a limited warranty. Be sure to consider only low mileage replacement motors, such as those from wrecked vehicles.
I'm not touchin' this question with a ten-foot pole-
@jamnblues, why am I not surprised? I can hear the gears turning in your head!
Looking for a Used Malibu in your area?
CarGurus has 82,166 nationwide Malibu listings starting at $1,800.
Search Chevrolet Malibu Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Malibu Experts