It sucks . Seriously, I think one advantage to vacuum is that it's less expensive to engineer certain types of control systems. It may appear to be less reliable...but, the prime movers in a vacuum system are a lot less complicated than those similar components in an electrically actuated system. I personally like it because it doesn't catch fire when it shorts out, it's a lot easier to isolate individual components and test them...like I said before...it sucks...and overall it's been my experience that replacement costs are lower on vacuum systems..IMHO

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..