It'* a 93 series 1 with plastic upper intake. I checked the throttle body gasket like you said it looked fine but the coolant has some rust in it.

Bad gasket on lower intake manifold. Search for the thread I did as my son placed lots of pictures and watch that youtube link. It was great.

If you have a helper, and its above zero whereever you are, its not that bad a job. Except for that %$#@pipe!

ok not too bad I was just hoping it wasn't the head. Could you link your thread too. I searched your profile but couldn't find it. Thanks for your help.

I dont know how to do that!!! Go to the park ave forum and search for "blowing white smoke".

Ok found it. Thanks.

93 blowing white smoke and running rough - Page 2

Sorry. Totally different foroum. Go to "buick forums". Then its under park ave from nov or dec 2013. title starts "93 blowing white smoke"

Ok got it torn down and the lower intake gaskets are new. It looks like the head gaskets are new too because they're fel-pro. What should i check next?

I think you should start a new thread with the issue in the title. Maybe duplicate it in the buick forum.

if someone changed the head gaskets, it could have overheated for them and warped or cracked the head. you should have them inspected by some one who knows what to look for