Hello everyone, The car: 400sel, 131,000 miles. New Parts: Engine harness, 2 Dis. caps, 2 rotors, 2 coil packs, NGK plugs, wires. I'm having a misfire issue. I unplugged the mass air sensor and the misfire is less frequent and much less noticeable. Plugged in, it misses more and hesitates more. I've been driving around with it unplugged until the new MAF arrives. Could a bad MAF connected or disconnected cause a misfire? Also, yesterday I put in a bottle of Injector cleaner and the misfire went away. But today it is back. Any help would be much appreciated.