2000 Ford Windstar with a rough, low idle, occasionally stalling when coming to a stop. 

I put off repairing this for as long as I could, which as with most things, is not a good idea as it causes more damage.

The end diagnosis is what I expected, though the cost of repairing this via a professional is expensive, but I needed it done quick and with little frustuation.

Diagnosis:

• Intake Manifold Gasket leak
• EGR Valve failing due to working itself to death trying to compensate for the intake leak

Other necessary work (120K miles)

• Major tune-up
• 02 Sensor, there are 4, but supposedly only 1 is bad

Over-all putting off the work caused the EGR issue, but the tune-up and 02 sensor have been needed for a long time; i decided to have these done as well, if you've ever tried to get to the back plugs on the windstar you know why.

Total estimated cost $1100-1200, ouch.  I should do it myself, the intake kit is about $109.00, but it is a big job, and then throw in the 02 sensor, egr, plugs, wires etc and it's easily $400+ in parts alone....I needed it done right so we'd have a reliable vehicle.