ok heres the scoop, my car is a 92 5-speed SC. it runs great but the check engine light comes on and goes off when it wants to. it runs good but give it some gas and it stars to hesitate on the boost side. then the boost gauge jumps and the car comes to life. sometimes. it only happens every once and awhile. then when i stop at a light with the climate control on the engines idles bad and drops to about 500, then kicks itself back up to 750. without the A/C on it does it sometimes too. sometimes it starts great and sometimes it takes like 5 minutes and there is black smoke rolling from the exhaust. ive ran codes and it said ego lean and ego rich, i didnt clear them and ran it again and it said 111 ( system pass) but my light still comes on!! i have an otc advanced from MAC($4000) computer. can someone tell me if my problems are related or what???