Hey guys, I'm stumped.

Say I leave the car overnight or 8hours after I get out of work. I have to leave the key in the ignition on the 'ON' position for a little bit to start but the start is rough/weak.

Sometimes the first try won't start but the 2nd try would work.

I've changed:

Starter (2x), Battery, Spark plugs...

What can it be? The Crank Position Sensor? Fuel pump? Fuel Rail?

Any help would be appreciated.

btw: 2000 maxima stock. And the temp. wouldn't matter. But it is worst on very COLD days.

 

Plastic upper intake manifold leak.

Search around for gasket replacement info.

 

I'm having a similar problem, when it's really cold, it barely starts.
It also randomly fires for a split sec then cranks over and takes a few seconds to start