Alright guys, here's the update:
I replaced the MAF as well as the air filter and reset the CEL. After two weeks of driving, the P1128/P1130 codes have never reappeared and the cars appears to be driving well (no more popping/back firing sounds), BUT I have a new problem:
When at idle, the rpms jump from 850 down to 400-500 rpms and then back up over and over (looping). The lights on the dash even dim/flicker when the rpms drop. The car hasn't yet died because of a low idle, but it sure does come close. I DO NOT have any CEL now, so I'm not sure where to start. I have read that it might possibly be an O2 sensor or a vacumm leak, but who knows. Any suggestions are highly appreciated.
Now my Idle is erratic
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