Engine alternately runs very rough or races. I detected a vacuum leak under the throttle body towards the fire wall. The part has an elbow connection. What is this? The leak seems to come from the short fat hose that connects to the throttle body. I aslready replaced the IAS.
SOURCE: My bmw 323i backfired after cleaning the throttle
sounds like you an idle arecontrol valve to me, wich by the way is the only thing that really needs cleaned, make sure the air boot is not torn on the smaller part going to that vlv it tears at the bend you will need a mirror to see if in the car still, also check the plug on the same vlv make sure it is plugged in all the way, also also check the connector on the throttle itself the white arrows must be aligned and touching let me know what you find
SOURCE: 2001 ford expedition 4.6 runs rough when cold
make sure you have the plugs gapped properly this can also cause this problem
SOURCE: 1990 Pontiac Grand Am 2.5 L engine. Leaking
That drain line is for the box that holds the air conditioner evaporator and the heater coil. It seems that your heater coil has sprung a leak and the leaked fluid is coming out the drain. You have to replace the heater coil, which on most cars involves removing a lot of the interior equipment, including the dash board on many cars. A job best left for the repair shop unless you're very adventurous and patient. Even then you will have to take it to a shop to have the air conditioning system recharged.
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It's an 02 Mercury Sable 3.0 engine.
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