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if you're getting it started, it's not the battery as once it starts the alternator takes over. Could be alternator, but doubtful.
Are you getting a CEL? If so, just go to Autozone and get the codes pulled for free and post them here. W/out CEL, it could be a # of things - MAF being one of them (sometimes triggers and sometimes doesn't trigger CEL).
To see if it is the MAF, disconnect the MAF plug (do not remove MAF) and then the neg terminal on battery for 50 seconds (longer ok if you have radio code if needed). Then reconnect battery and start. If it starts/runs fine/better, it's probably MAF ($150-200 and a super easy DIY - 2 security torx screws).
O2 sensors, I believe, would trigger CEL so if no CEL these are probably OK too.
Coil packs could be bad which would cause rough/no running. Has there been much rain recently?
Alarm issue is probably unrelated but is it wet under drivers seat? Maybe micro-switch in door or motion sensor going bad. Any other strange issues like radio won't shut off, problems w/ lights - if so, could be bad ignition switch but don't think this is related to the engine problems you are having.
Good luck and let us know what you find.
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