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try giving it a little fuel to keep it going. if it still goes but will shakes and splutters and coughs before smoothing out it sounds like fuel is draining back from your engine to the tank. if you have an electric fuel primer pump that turns on when you turn the ignition to on you should be able to hear an electric whine unless your car either does not feature one or its not audiable/ possibly not working. leave your car at "on" for 10 seconds then try starting it as well. see if it improves
First off is your check engine light on? I know you said your scanner doesn't read OBD1 (pre96) but it wouldn't matter if it did if your engine light isn't on there wont be anything to read.
while it sounds like a misfire it is possible your timing is off.
To be sure, there is a trick you can do to to read the codes if the engine light is on. theres a video on youtube that gives a decent explanation of how to read it, best part is its free. Although Im not sure about the location of the code reading port on your 91, if it isn't in the normal location like the one in the video just google search OBD1 code port location (then year make and model) shouldn't be hard to find.
sounds like the timing is off. check the firing order to be sure your plug wires are on the correct positions on the coil packs. if that checks out, possibly a timing chain may need replaced. i hope this helps don k.
Check if there isn't any blown "engine control" fuse. It looks like the computer isn't adjusting the timing as the engine accelerates. I assume you've already checked for open circuits at the ignition system. If not, do so, making sure all your connections are tight.
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