u/Expensive_Mine_7835

Hi all, could use some advice here. 1995 Firebird LT1 V8 had optispark replaced, along with new water pump. Shop has told me it solved the bucking and jerking motions it was having, but engine is overheating at idle. The tech said he thinks it’s an air bubble that builds at idle then when on pedal it circulates/dissipates.

Tech said only thing he can think of is head gasket repair or new motor swap.

Any thoughts/advice on what I should suggest they look into deeper before these actions?