I have checked this thing up and down for a vacuum leak. I have sprayed the lines and intake down and inspected every connection. For a smoke test on these a cigar works very well. Take the brake booster off and light the cigar and let the hose smoke it. I’ve done it on other cars and it showed the leak in a hurry!!!!! I will check the exhaust header connection at down pipe again. Once I get some money I am going to replace the o2 sensor as a try. In the mean time I will continue to check for vacuum and exhaust leaks.
