Air Leak
3 Answers
you have a vacum problem. Your probable burning through gas. get a good boost guage and fix the vac leak after that when the car idles if it runs with 20 lbs of vac at idle its fineif not check timing and so on.
Look up Boost leak testers or go on you tube and build one. pump the engine up with air and it makes finding them cake!
lol sounds like intake manifold gasket leak, pull it off and check gasket, not that its easy but most likely. either that or a bad o-ring at one of your injectors.