Ok my girlfriend has a 93 altima SE. it was having a problem where it would stall out. I checked the ECU and it said it was throwing a code 11. I replaced the dist. and everything is great. the ecu says its throwing a code 55, which is normal operation, but it keeps popping up. I cleared the ECU the way the manual said to. the check engine light still throws code 55 like every other day. How to I get the CEL to stop throwing it?