Rough idle and bad acceleration when warm, stalls while idling at light. on 1999 Mazda Protege

This first started after an alternator problem. While driving, I noticed that the battery light was on and I was losing power to all electrical systems. By the time I got to the shop the car was barely drivable; It wouldn't shift gears, it was revving up and down randomly, lights and turn signals were not working correctly, and so on.. After we replaced the alternator I first thought that all of the problems were fixed. However, after about 1 minute of driving, the car would idle dangerously low while waiting at intersections and occasionally stall. After a cold start in the morning, it would run fine for about 2 minutes until it warmed up, and then the problems would start again. Symptoms are almost identical to those in this post: That problem was solved by replacing the distributor cap. However, to my (very limited) knowledge, the 99 Mazda protege does not have a distributor. Please correct me if I'm wrong, but if I am not, I have no clue where to start.

by in Buffalo, NY on August 02, 2013
1 answer 4 comments
ANSWER by on August 02, 2013
How much or how far has it been driven since the battery power was lost/disconnected? It may just need to relearn idle strategy . Try letting it idle for awhile, then drive it, should take care of itself. (Possible) Check engine light on?
COMMENT by on August 02, 2013
Ok I'll leave it on for a while tomorrow morning. I drive it for no more than 10 minutes total around town since I replaced the alternator, no changes yet. And no, none of the dash lights are on.
COMMENT by on August 02, 2013
No light on is good ! Idle relearn might just take care of this. If not, possible vacuum leak, hose could have been knocked loose.
COMMENT by on August 03, 2013
Let it idle this morning for about 15 minutes. Before I left, I revved it up to about 2000-2500 rpm and back down, no problems. But after about a minute of driving it started again. It's very weird; it only has this problem about half the times I stop. Sometimes I stop at a light and its running perfectly. Other times I have to keep my foot on the pedal to prevent it from stalling.
COMMENT by on December 10, 2013
Hello, I am dealing with the same issue with my Mazda Protege right now (starts/drives fine until it's warmed up, then at intersections it bogs down sometimes stalling out etc.). Ever figure out what was causing this? Thanks!
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