acceleration problem

[Delorean17@xxxx]

Hello,
My car is having a hard time accelerating. it just gives small back 
fires when you give it gas.(not even driveable) I crawled under the car and 
found that the wire coming from the Oxygen sensor was cut. I just replaced 
the oxygen sensor with a new one today(From Grady) but I still have the 
problem. If I close the full throttle microswitch the car drives great but I 
know that isnt the best for it(I drove down driveway). My frequency valve is 
working but just not coming on by itself. what could be the problem? 
perhaps the lambda ECU? since the Frequency valve does work with the full 
throttle microswitch depressed, the lambda RELAY is working, correct? or am 
I thinking wrong.
I know my idle-speed motor is stuck open(1000 RPMs). I will replace that 
soon but I know that doesnt have anything to do with my acceleration problem.
In the back of the engine compartment there is a black wire with an 0 
connector on it. When I ground this wire the RPMS go right up near 2000 
rpms. I thought this was supposed to be grounded at all times, is it?. any 
ideas? I will be back on Sunday to check my mail. If it turns out to be the 
ECU, I have a perfect ignition ECU I will trade for it.

Thank You
David
#2496-coming back from sitting