Volvo: Volvo 240 86 auto Cold Stall, volvo 240 86, crank shaft

Question
Volvo 240 '86 Automatic GL
no turbo, AC, 4-cylinder
Ok, we pulled the engine out to fix the main oil gasket on the crank of the engine. Just peed out oil. So that works. But it didn't do this before we pulled the motor out and it's doing it now. When I start it idles well, but if I stomp on the gas hard, it dies. Now if we disconnect one 2-3 prong terminal  (think 3) below the fuel injector, it stops. We didn't switch them cause we tried it the other way and it kept reving up and down then back up then back down. So we put it back and it still killed it on a hard gas stomp. The terminal is located above the distributor. I have the model where it is on the block and not the crank shaft. But below the fuel injector manifold amd it faces the radiator when unplugged. Easy to see from kneeling on the bumper. The only thing I can think of is that the unit it plugs into, I don't know what it is or what it is called so that might help, is defective. Or it is because I cleaned the Jammed Flame trap and it is in that area. But clogged flame traps are bad so I just cleaned out the carbon. It runs, everything works. Just it likes one wire unplugged. Everything else is to spec. Any help would be greatly appreciated.

Answer
Based on your description, it sounds like the device you talk about could be one or two things, both of which could cause the problems you are describing.  One is the frequency valve, which controls the the mixture and timing of the fuel injection based on the speed of the motor.  If that is malfunctioning, the engine can either not start, or cut out upon increased RPM's.  The other thing it could be is the knock sensor.  If that has gone bad, then the computer has no way to tell the timing of the engine, and you can have fuel mixture problems that result.  I would check both of those out.  Good luck!