Replace the engine coolant temp sensor, the one near the thermostat housing.
bad fuel pump, dirty injectors, vacuum leak
how to start a 1993 chevy tahoe without a key
Not without "hotwiring" it
Most oxygen sensors are either on the exaust headpipe just after the manifold or on the manifold. I don't know where it is exactly on the Lumina but that is where you should start looking.
I would start at 20 ft lbs on alum. 25 on cast.
Female cats typically start spraying around 6 to 12 months of age.
roll it off a cliff
start with center bolts and work your way out in a circular patternaltenating from side to side
Check for vacuum leaks. The gasket was known to blow out between the throttle body and the intake manifold.
For an engine to start it needs spark to the plugs and fuel. Without both it will not start.
most older trucks can be started without a key
start at 1 1/2 turns out from seated in and adjust for highest manifold vacuum at idle