Hey Guys,

I have posted on this awhile back, but some new things have come to light. 1994 C220 with about 120k miles on it. The idle is rough and car misses, surges. I have replaced the MAF, plugs and wires, OVP, countless other things. I am just starting to notice a few other things, it only starts when I turn on either the AC or the Heat. Also if you are going up a hill or anything with the heat on, you hear a whistling through the vents, like a vacuum leak. I have looked and see none, do these symptoms ring a bell for anyone?

Thanks for any help guys.

Jason