New to the forum and it looks like a good place to get some help. My 98 Civic DX's engine light has been on for quite some time. I've been driving it like this for about 2 yrs but just recently started having probs with it. The autopart store ran a check and it came up with PO135 which their printout said it was the A/ F sensor heater but also list probable causes for the CEL: 1- open or short circuit condition. 2- poor electrical connection. 3- faulty A/ F sensor 1. I know the sensor is likely bad but the prob Im having is this that started just 2 months ago: At random times, the car will buck and then just die out. I can restart it while rolling (manual trans.) but it takes a few or more tries to start. There were days it would run fine and not die out. Just before it stalls though it bucks and thats how I can tell it stalled on me. Would the A/ F sensor cause this or does it sound electrical issue. Not sure but does A/ F stand for air/ fuel mixture? What could be the problem. Im trying to take the cheapest route for I am layed off and my son and I dont have extra money for these problems. I sure appreciate the help.