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Q: 1993 Mazda 626 Cronos 2.0 5speed. Car is acting quite strange and rather quickly on 1993 Mazda 626

Drove car during the day with no problem except I do know the battery was weak as cold starts were labored and wipers were slower than normal. Started car 4-5 hours later and got two minutes up the road and idle was a bit erratic (bouncing 800 - 1000 rpm. Normally sits at 750 when warm. Also noticed lack of power and what sounded like exhaust leak. Thought EGR possibly? Went to start car next day and of course battery completly dead. As this is a 20 year old car I don't want to invest to much into it and definitely don't want to replace parts by guessing.No indication from dash like engine light on or anything. Any help would be greatly appreciated
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a bad battery can make your car run bad. Start by taking out the battery and have it tested for free at an auto parts store. If your energetic enough take out the alternator as well and hae them test that for free too. Either your your battery has a bad cell or your alternator is not charging properly.
I never thought to do that. I will do that tomorrow. Thank you. I'll let you know how I make out.

Looks more like a burnt exhaust valve. Battery and alt good. Still very labored to start and loud exhaust sound up by exhaust manifold (behind heat shield)
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