not sure if the boost gauge on those is computer or mechanical. it would be a vaccum line. double check everything you removed because one little thing could cause a problem. the MAF sensor could cause everything your having problems with. yes it is possible both are bad, maybe try double checking around the throttle body. did you remove the sensors from the tb or just leave it? it could be many things. sounds like the lim gasket is fine and everything but something went wrong in the putting back together of another componant that was removed?
