question about warm up time.

[Nate Beck]

I just had a question about warm up on my 1985 coupe GT.

My mechanic said recently that I had a leak in my vacumn canister. That is
the one on the firewall by the battery, right?

Also I just changed my oil and filter, original Audi filter with Mobile 1
10/30.  Is that the right oil?

but know, if I do not let my car warm up for at least 10 minutes or so, it
hesitates real bad, knocking and such.

My question is this.  Is this related to the vacumn leak? or does anyone
else have any ideas?

Thanks

Nate