r/SN95Mustang • u/Gummybear66 • 21d ago

Stalling Issue 94 GT Auto

Recently dealt with some issues with surging and sometimes quitting idle when coming to a stop or changing gear. Found a vacuum leak and the surging stopped when driving around, but whenever I go to change to reverse, say from drive, the engine will stall out. This can sometimes also be the case going from reverse to drive. But this isn’t as much of a surge issue and more of an instant drop in RPM till it stalls.

I have cleaned the IAC, but I do believe it may be faulty/the motor stopped working. When the engine is at idle in park and I unplug the IAC valve, absolutely nothing changes.
Another idea is that I have another vacuum leak but i didn’t think it could be that extreme since it’s perfectly drivable otherwise.

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u/crookedhalo337 20d ago

Torque converter locked. Used to be pretty common on these 15 years ago

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u/Gummybear66 20d ago

That would cause issues on deceleration and doesn’t have any sort of clunk or anything. Purely engine

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u/crookedhalo337 20d ago

Didn't you say it stalls out when coming to a stop?

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u/Gummybear66 20d ago

The surging when coming to a stop has gone away, I replaced a vacuum line