Sometimes when I brake to come to a stop, my car loses power: the whole thing shudders, RPMs take a dive. It doesn’t start immediately on braking. It starts when I am almost at a stop, but not at a full stop. If it’s relevant, I generally brake quite gradually, starting several car lengths away. So there are several seconds between onset of braking and onset of power loss. It starts while the brake is depressed. It does not stop when I let up on the brake. It does stop when I depress the accelerator. If I am idling at a light, it might happen. If I am just going slow without braking, it doesn’t happen. Braking is fine in all circumstances except coming to a full stop.
'93 Mustang, 4-cyl, 2.3L, manual, fuel-injected
It’s been doing this for years, actually, and yes, I’ve been just dealing with it instead of getting it checked out. Usually a little rev of the engine gets her through it. Last night, it actually stalled, several times in fact. It restarted, but it did take cranking it for a while for it to restart.
Now that I think about it, my battery might be up for replacement. It’s probably around 7 years old, and the last 6 have been very light driving, maybe 3k per year. But like I said, this is an ongoing problem. What should I be thinking about besides the battery, and what is a mechanic likely to tell me?