Sounds like the hose that connects "the venturi in the air intake manifold" to the "vacuum side of the diaphragm on the injector pump" came off.
In normal operation, the level of vacuum in this hose controls the position of "the rack" in the injector pump and this directly controls the quantity of fuel fed into each and every cylinder of your engine. Foot off the accerator, means the butterfly valve in the intake manifold is almost completely closed. So air is rushing at top speed through the venturi. This produces maximaum vacuum in the venturi which pulls the rack into the "minimum fuel quantity" (engine idling) position. On the other hand, if you plant your foot on the accelerator - the butterfly opens wide - so the airspeed through the venturi drops dramatically. This dramatically reduces the vacuum that's been pulling the rack (via the leather diaphragm). - So the spring is able to move the rack towards the "maximum fuel" (maximum power) end.
Now if the hose comes off. - There is a COMPLETE absence of vacuum - which is not normally achievable under any other circumstances when the engine is running. So your engine gets more fuel that it has EVER got before!!!!
What is really scary is that "high power" still occurs with the butterfly valve closed (foot off the accerator). --- I've tried it by taking off that hose while my engine is idling! She goes up to maximum revs in the blink of an eye!!!!
So please please please. Make sure that hose can never come off again. And such an event in a vehicle that has had the EDIC control replaced with a manual pull-cable could be DISASTEROUS!!! (Because you can't shut the engine down so easily as by just turning off the key.)
