The gas tank, maybe?
MOST LIKELY IT IS THE HEATER CORE LEAKING OR IT COULD BE WATER CONDENSATION FROM THE A/C EVAPORATOR CORE.
I had the same thing happen on my '87. It started after the windshield was replaced & something wasn't done right there that let water in at the bottom of it.
Its your transmission slipping. Are you sure u dont have any leaks coming from your transmission causig the transmission to slip. That happened to my acura integra.
Also, no visible leaks in the lines, all brake pads were changed less than 4 months ago. Master Cylinder has been going dry in 2 days time, now there are absolutely no brakes after I filled it back up today.
the air conditioning pump is on the passenger side thats the only thing that leaks water there
I don't kknow what acura you have but on my 1990 integra gs low coolant level will cause the erratic rpm. Also the intake manifold gasket could be leaking causing an erratic rpm condition check all your sensors, mostly the throttle position sensor (on the throttle body) also check to make sure you dont have any vacuum leaks.
With a helper go to a car wash. Spray around the door and windshield with the helper inside to see where the water is coming from. This is the easiest way to find the leaks and plug or repair them.
The proper question is "where". Find out where it's leaking and you'll know why. If it's leaking from front or rear, it's probably a seal rather than a gasket. Also, changing an oil pan gasket can be trickey and if you didn't do it right it will still leak.
sounds like you have a cracked head
windsheild leaks
it could be the window
heator core
replace heater core under dash passenger side