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I have a '69 fuel-injected automatic Fastback. When I drive at freeway speeds my engine has sudden extreme losses of power. If I pump the gas pedal while it is having its power loss the engine will die. This problem has become so frequent and the engine dies so often I don't think it will get me to work on Monday unless I figure this out. We ran a some of the fuel-injection electronics diagnostics per the "How To Keep Your Volkswagen Alive" book and we discovered that the pressure switch (lives under the right-hand pair of manifold tubes) was disconnected from its electical connection. Upon reconnecting it we found it to read the opposite of what the book said it should read. it read 0 ohms when left alone and infinity when the tube was sucked on. The book stated it should be the other way around. We tried running the car with the pressure switch plugged in and we couldn't even get it down the street. It died and refused to start and stay running. We had to disconnect the pressure switch to get it back to the house (and even with it disconnected it was difficult to get the car to remain started). Help, please?? The "How To Keep Your Volkswagen Alive" book said that the throttle switch must have a number specific to my engine, but the VW parts place that sold me my current switch knew nothing about that. Would an identical looking throttle-switch be the wrong one for my car? Any help as soon as possible would be appreciated. Becky ill '69 FI AT Fastback