Check volatage to it. Pull the plug and start the car and check the voltage at the plug. I think I had similar press. when I lost voltage. The vacuume had no effect. How does it run. What happened when it changed? Have you seen the web site from the guy from rennlist. He is a guru I was able to e-mail him for some answers.
http://members.rennlist.com/jimwms/
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1994 Lotus Esprit S4 - interesting!
84 lime green back date (LWB 911R) SOLD 
RSR look hot rod, based on 75' SOLD
73 911t 3.0SC Hot rod Gulf Blue - Sold.
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