[vex]

So I'm having trouble with my car just a month or so before I plan on putting on all the stuff for the turbo. My car now on occasion feels like there's a massive vacuum leak. The trouble is it's intermittent. I recently replaced my EGR valve with a blockoff plate and while I was attempting to remove the gasket from the EGR valve it disintegrated. I used RTV on it and made a pretty good seal. I took it out for a test drive and I noticed that after it warmed up it started behaving like it there was an air leak. I then took it all apart and re-applied RTV more liberally and that seemed to correct my issue.

I then had to park the car for two weeks for a trip out of state. I came back and I started to have these problems again. The temperature has been getting extremely low (down to the single digits) and that's when the problems seem to have started.

I'm curious as to whether or not the RTV is unable to seal properly like it used to and so I should order an EGR valve gasket and re-do it, or if my engine is on the fritz and is in need of a rebuild? I'm going to do a compression test on it tomorrow to see what the numbers are. The last time I did one however my numbers were excellent 115/115 and hit 30/30/30 on each face and that was maybe, MAYBE 8 months ago.

Now more to the point since I am planning on putting the turbo on within the next few months should I rebuild the engine anyways? Just build and port it when I put the turbo on while I prep the engine bay? How much do soft seal rebuild kits go for (as I think that my apex seals are fine)?