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Today i got something very special, which i found in the USA: A box with "Maintenance of the Datsun 240Z Sports" Service slide films. Let me explain: The Box contains 7 small, numbered plastic cans. Each can has a dia film of colour photos (aka "Slides"). The booklet was Printed in November 1969. So it is from the very beginning of the 240Z. Additionally, there is a booklet which is called "Slide narration" the booklet contains the text to each slide. My understanding is that this was used to train workshop employees. Whoever trained them got a bunch of coloured slides which show how to maintain the 240Z in a workshop, and a book which shows what to mention for each slide. The purpose of the whole kit is also mentioned in the foreword on the first page of the booklet: I have never seen such a box before and think it's quite cool. It's basically a Service manual in colour photos. Some photos appear to be actually the same as in the black-and-white printed Factory Service manual. There are some awesome photos of Nissan works employees working on the cars. I still have to read it all and look through the photos. There are also many graphics and drawings shown, which I have never seen before, and most probably were made specifically for training purposes. I'm already looking for a dia scanner to digitalize them all and if I find time, I will share some of them with you. More updates in the coming days. I have planned some work and there is a sea-freight crate from Japan waiting for me to be picked up.

For the time that you're spending on the problem it might be worth the length of hose and the clamps to get that real-time data. Borrowed this from a Corvette forum.

That's a great idea since that is currently my exact setup. I'll give that a try this weekend - thanks for that

These are important. Pull them apart and shine the connections up, maybe some dialectic grease too. http://www.atlanticz.ca/zclub/techtips/runningrich/bullets.jpg

It's not the same. It takes a lot less fuel sitting still at 3K sitting than driving around. The load is so much lower. Try this... Sit in the driver's seat and with the engine running, push the gas pedal down until the engine is spinning at 3K. Note how little pedal it takes to do that. Way less pedal to do that than do drive around under load. Hope you can make some headway with this issue. I'm sure you're tired of dealing with it.

Ya, I'll give that a shot this weekend I'm thinking

Seems like you're stuck in the classic "what happened" versus "make it run right" dilemma. Cliff's EGR suggestion might not cause a vacuum leak but might cause full-time EGR. Diluting the fuel-air mixture, lowering power. Might explain the lower idle RPM. Also not clear if your focus on the gauge reading is coloring your impressions or not. Trying to tune to the gauge instead of the actual performance. No offense, the human brain is a strange thing. You're discounting people's suggestions, but aren't showing that you fully understand the source of the problem. You're in the nope, nope, nope regime. If running without the vacuum hose helps power then using the potentiometer should also. Does the engine still "front-fire" if you try to accelerate at a moderate rate? Off of the full throttle area of the TPS? You're saying it has low power and lean gauge readings. How is power if you just go full throttle? When, exactly, do you feel that it has low power compared to before? Maybe all of the chaos broke some junk loose and clogged some injectors. My engine still ran well with these, below, after I replaced the AFM. Those injectors came with the car. But it ran a lot better with new injectors. I probably never needed a new AFM.