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Wow, there are a number of things. I really would have to test drive it to know what is going on, but let's talk about a couple of possible reasons. It could be the transmission torque converter (TC) lock-up clutch is stuck. Among other things that the torque converter does it is the part of the transmission that allows you to come to a stop while the vehicle is still in drive, without you having to shift it into neutral everytime. If the TC lock-up clutch is stuck in an applied position, you lose that "freewheeling" capability, thus the engine will shut off, unless you put the trans selector into neutral. Another possibilty is you may have a faulty Idle Air Control (IAC), and/or a gummed up trottle body. It may be that the Powertrain Control Module (PCM) can't properly control the idle speed because of one of those conditions, and the engine is shutting off due to a low-idle condition. Another possibility is a vacuum leak. A vacuum leak will cause the PCM to have a hard time controling the idle, and the added burden of putting the vehicle into gear, is enough to cause it to shut off. Just a couple of quick things I can think of off the top of my head.

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โˆ™ 2006-03-08 04:15:32
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Q: What causes a 1991 Aerostar XL to stall when put into gear It is automatic?
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