If its inside the cab at the firewall, its probably your heater core which is located on the passenger side under the dash. This repair is usually not much fun. If its leaking in the engine compartment near the firewall, its probably a heater hose that is failing. This is an easy repair
In my experience, you can splice in fuel hose where there are fuel line leaks in some, if not most scenarios. BUT if it is in a dangerous area, like near exhaust engine etc, you should probably replace metal with metal. It is always better to be safe than sorry.
get a new hose or tighten the old one up
The fix is replacing the leaking part.
leaking in large amounts? i would check a cracked hose.
heater hose?
What's under the intake is not a hose, it's a pipe which a hose attaches to behind the intake manifold near the firewall. If the hose is leaking, it's a relatively easy task to replace it. If the pipe is leaking, you will have to remove the intake manifold which is not an easy task (minimum 6 hours to remove and replace the manifold!)
The leak is most likely coming from the heater core or a heater hose near the fire wall.
NO NO, That would be a intake gasket leaking, not a head gasket. You also should check where the heater hose hooks up on the intake, it may be leaking.
crankshaft sensor. 10 to 20 dollars to fix.
water pump .(gasket,intake,hose)
Was the air sucking through a loose hose? On my 2000 two-door I simply out the hose back on and move the hose clamp to a point where it would grip better. My alternative repair is to replace the hose clamp if the hose continues to slip off even after adjusting the stock hose clamp. Correction on the last answer. The air would not be sucked through the loose hose - it's actually sucked through the hose connector on the engine component (fuel injector system) after the hose slips off. The advice on the hose clamp is still good advice if this is the type of problem you are having - a loose hose that normally connects to the injector system.