Oldsmobile Questions? Ask a Mechanic for Answers ASAP
Sorry you have been waiting so long. 2 things that you have mentioned point toward a lean fuel mixture and possibly a vacuum leak. Before suspecting any intake manifold gaskets or anything else like that, you should check all of the vacuum hoses and make sure none fell off, or otherwise leaking. Also, if any work was just done prior to this problem double-check the vacuum hose routing.
Lean fuel mixtures will cause the engine to pop or backfire back out the intake because when the cool air hits the unburned gas it explodes when the intake valve is still open. This can be caused by a vacuum leak and too much air entering the intake manifold throwing off the fuel mixture.
have you pinpointed the vacuum leak?