Lately I’ve been dealing with bad compression in cylinder 1. It reads right below 120. But when I drive the car it skips/lags. I’m not sure if it’s a bad engine or I have some bad fuel injectors. My check engine is on and it misfires on every single cylinder. Also the O2 sensor is bad. I noticed that it wastes too much gas idling, I hear popping by the exhaust pipe and I don’t really drive the car in winter. Any suggestions as what it could be or should I just hand it over for someone to inspect? Thanks!