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Originally Posted by Matty B
Your fuel pressure is fine well within spec, however with only that much drop when the vaccum is hooked up ~6 psi that means you only have about 6 in vaccuum at idle. I higghly suspect you have a vaccuum leak of some sort from the sounds of it. Id say go through it again and recheck it. IIRC the MAP sensor is underneath the plenum and if it it hooked up with a hose thats a possible spot for a leak and also why the motor could be running wrong ie down on hp and such. Id check there and report back, I saw this happen on a 210 with this motor at the shop and once we put a new piece of tubing on it, it ran perfectly. hope this helps.
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pressure looks good. I've never seen pressure drop in psi equal to your vacuum. In other words, if he had 18" of vacuum there will not be an 18# difference in fuel pressure with the vacuum reference attached. PSI is not the same as vacuum.
If there is not a vacuum leak, and if the throttle blade is set properly and closing then the next thing I'd look at is the idle air control motor. I think you're running the stock Ramjet computer with no end-user tuning which is unfortunate. There are a couple things to try if you can adjust the computer, but don't help if you cannot.
You might try removing the IAC and cleaning it as they do sometimes stick. Possibly plugging it off if possible just to start it and see if the idle drops, then at least you'd know you are dealing with the right issue.
Jody