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Story is, my car now only pulls 12 Hg vacuum at idle and the needle fluctuates ever so slightly. Redid almost my entire engine's vacuum lines, and that failed to solve the problem. Under heavy engine braking I can get it to 17 (what it idled at before), but even when its as warm as it gets it will not pull more then 12 at idle. The idle is perfectly fine, rock solid 800rpm. Could an exhaust leak (I have a largish one) or a leak in my ghetto intake pipe cause low idle vacuum?
As well, this just started a couple days ago, and I can't replicate the problem no matter how hard I try, but sometimes my car seems to lose fuel delivery almost completely sporadically for a second or two at most. At idle, it will stumble but catch again before stalling. At part throttle, it will sputter and buck but eventually smooth out again. Kicking the transmission down to burn up a hill, the car ran fine - totally fine, but just as it transitioned into boost, my blinky AF gauge stayed all the way lean for about two seconds, the car had no power, and then all the sudden it went to rich like it usually does and the car picked up a LOT.
The last problem makes me think my FMU is dying, but that shouldn't affect idle and part throttle when it shouldn't be doing anything.. should it? Fuel lines aren't leaking, put on a new vacuum hose and that did not solve it (even though the old one was loose as hell), fuel pump should be alright now... 
1995 Eagle Talon ESi
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