First I'd check the 3rd hose to the vent valve, it is shorter, and is the drain hose at the bottom of the vent. (gotta be flexable..) Or it could even be the manifold gaskets getting old/dry and leaking. It could really be a number of things, which is why it really helps to have the proper testers and equiptment for testing. The easiest way to find a vacuum leak is with a smoke tester, but not all shops have them.

It may be worth getting a proper diagnosis done, as long as it is by someone who actually knows how to test to find the real problems. Some shops just guess for problems like this and throw parts at it, which you can do yourself.

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2003 4.6is