hello
on my 84 242 ti i found some fresh oil on the intake manifold after a 4 hour drive. recently i have had a increased idle and the car has been running a bit lean. sometimes when cold if it hasn't been driven in a whie it idles fine but after boosting it will idle at 1500 instead of 1000 rpm.

where do you think this leak is? is there a gasket that has gone bad or do things just need to be retightened, cleaned and sealed

thanks