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1g tsi awd, no power rough idle, any ideas besides vac leak

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jared98gst

10+ Year Contributor
197
26
Jul 24, 2011
edmond, Oklahoma
Picked up a 91 tsi awd talon
Built trans rest is stock minus the 16g with a busted wastegate(creeped to full 12 psi in 2nd and up before this happened)
Strung out second the other night
Clutch in, turned into my complex and power was way down
Rough choppy idle, poly mounts so vibrations
Vac was reading -18 ish
Now down to around -14
New plugs new wires
No cel
Starts and runs every time still doesn't die
Won't build past 5 psi now
Really does seem like seems boost/vac leak but took all pipping off from turbo to tb
No cracks or blown out pieces put all back on retightened

Cam timing doesn't look to have jumped a tooth or anything
Checked at tdc pins on cam gears lined up straight up and lines on gears lined up 9 o'clock intake 3 o'clock exhaust
Driving the car under load no boost in 3rd won't accelerate for anything

Would have to be a serious gasket issue to affect idle like that right? Assuming all my piping is good which I believe it is
 
Perform a boost leak test first. Do NOT just assume you have none. You likely will.
 
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