Unplug the AMM, put in gear and see if it dies.
Inspect the intake tube between the AMM and throttle plate for being split open, check bottom side.
Putting car in gear, the engine will flex, it can open up the split in intake tube after the AMM.
If split open, remove intake tube. Clean off any dirt/dust. Get a helper. Gently stretch the intake tube.
Wrap the intake tube/split(s) with lots of electrical tape. Wrap the complete tube with electrical tape.
Install intake tube, retest.
Torque converter is basically a hydraulic slip clutch. Round torque housing bolts to the flywheel and transmission oil pump. Internal torque fins force trans fluid against the transmission side fins to power the transmission gearing.
The following would be very rare to have happen.
It depends on what transmission is in your car. Per Wikipedia information, you might have AW70L.
L=lockup. At about 55 or 59 mph the lock up valve will open causing the torque converter to
lock in place making it a direct drive from crankshaft thru the torque converter into transmission
gear speed 4 or OD. If AW70L, 4th gear lockup valve could be stuck open. When this happens, torque is in direct drive mode and engine will die when put into gear. Same as straight drive trans, put car in 1st gear, hold the brake pedal down and let out the clutch, engine dies.
You would need to look at the label on the transmission to find your model of transmission.
Volvo AW70 series transmissions – Wikipedia
The AW70 series is a group of 4-speed automatic transmissions built by Aisin-Warner, a Japanese-American joint venture company, for the Volvo 240, 740 and 940. There are three different models within the series, all based on the AW70, which was first used in 1981 Volvo models.[1]
AW70
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The AW70 is a 4 speed fully automatic transmission used in the Volvo 240, 740 and 940 series cars starting from 1982 up to 1998, with the end of production of the 940. From the 1989 model year a lock-up torque converter was offered which changed the designation to AW70L. This transmission was originally used in the US specification 1982 Volvo 240 with the B21F engine, as well as in 1983 with the B23F engine. The AW70 did not see worldwide usage until 1984 in certain 240 series cars.
AW71
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The AW71 and AW71L was a strengthened version of the AW70 transmission used in the Volvo 760, 940, and some 740s and 240s with turbocharged and higher-output naturally aspirated engines. Some have been seen in 1985-87 240s with the B230F engine. Also was used in late model European-spec Volvo 260 series cars. North American market Volvo 260 cars used the Borg Warner Type 55 transmission.
Identical to the Toyota A43D and A43DL except with different tailshaft housings and tailshaft flanges, both of which are interchangeable.