new battery..have had set with vag come two times. REset all the codes runs fine for a day. GEt back in next day...ck engine lite is back on along with the epc in yellow. It came on yesterday while driving but has tons of power. Does anything seem to think I may have a bad ecm? I got stuck in the road..it would start right up always has no problems..but having problems with the throttle body..showing misfires..etc. The thing will run good some times for a week then go all to pieces. I have had everything under the sun did to this car... new catalytic converter..have had two mechanics look at it..one guys says he thinks its the computer ecm or a loose connection. I want to know there is a plate under the windshield . I have removed it. What do I do from there to get to the computer.? I Can buy one and hve it changed but I know I'l have to get the keys programmed andall I think.