"85 w/ 2.8 & a4ld. wasn't running real happy but not too bad. Pulled trans & replaced converter seal & main seal. Fired it up & it won't idle. got it running long enough to try & warm it up & hit the brakes. Nasty groaning sound. Replaced brake booster but no change. No boost on brakes. substantial vacuum on oil filler inlet hose. Plugged booster hose-no change. Plugged pcv valve-no change. Modulator hose & new mod OK. What else should I be looking for?