Help!! Check engine light staying on and bettery light flickering/staying on

[Houndskull]

Just happend couple weeks ago. Check engine light stays on. So as the battery light is flickering. Brought it to my mechanic obviously MAF sensor for check engine but the battery was fine from the diagnostics. Now at low rev 2-3k rpm engind stutters. Kinda like if the CAI is kinda damp from a rainy day but its sunny as hell. Cleaned the MAF sensor today disconnected the battery. Stutter seems to be gone but the battery lights stays on now. Forgot to mention once its warmed up sort of past 3k rpm seems to be fine. Anybody else had this problem before i bring to mazda for an actual diagnostics? Its a '07 btw if you guys are wondering. Thanks for any inputs

[snowybaby]

My check engine light comes on all the time.. it'll stay on for a day or so, then just shut off.. we've never been able to find a reason why.. it always shuts off before I can get the diagnostic reader on it... at first, I thought it was my gas cap.. because it seemed to always come on after I pumped gas, but yesterday, it came on after I had to brake hard...

[ryan2.3]

^ if your light went out there can still be a history code to check for

[Houndskull]

If its the maf sensor then its a quick fix for me but if its the O2 either one of the 2 or the cat needs replacing then ouch. Then i have the battery issue to figure out. No hard starts either so im trying to figure iut why batt light stays on