Sometimes when I start the car the engine seems to “jump” for a second (makes a loud noise) but then drives fine with no issues. Motor mount loose?

Hello, someone really should listen to this -- someone with technical knowledge who could give you instant feedback. I can only guess -- and that guess would be that you could have the initial engagement of the air conditioning compressor kicking in, which can create a short, loud noise and quick surge to the engine. www.repairpal.com/repair-shops

Do not touch accelerator pedal while cranking engine.