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 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/