[DML] Engine vacuum problems?

["stainlessilusion" <5n-@xxxxxxx>]

I don't understand this... maybe someone can help me out here. Before
I begin, the ported switch lines are routed correctly, timing is on 13
and both vac/mechanical advances in/on the distributor are verified to
work. I have my vacuum supply line to ported switch disconnected at
the source (left/drivers side rear intake), my car (cold) starts up
great, and you can hit the road immediately with no engine/running
problems or smoke. I plug the vacuum line in and upon cold start, the
engine sputters and blows bluish/whitish smoke for a minute or 2.
Hitting the road immediately results in misfiring under even light
acceleration until warm, and once warm the engine still misfires under
load or going straight down the road with 3/4 accelerator travel.
Unplug this line and these problems do not exist; the engine runs
flawlessly -this is how I've been running for the past few weeks.
Unplugging the WUR and only running vac advance still makes the engine
misfire near 4,000 RPMs. Obviously the advance and WUR are what to
suspect- but my vac advance is fine and WUR is brand new. I'm not sure
what to make of this, but I would like to get it back to how it should
be with no problems. Thanks for any ideas/suggestions -----Dani B. #5003







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