Re: Simillar problem to mine
i dont mean to cause any "ben shut the **** up, or ben were only trying to help u ass", but i think you should disregard the sensors as the problem, the sensors are acting this way because of a hard fault. I think you will find disconnecting either the oxygen or MAP sensor will still give a default mixture and will still cause this problem, by removing the map vacumn if the problem goes away, this does NOT indicate a faulty MAP sensor necessarily.
I think theres a fuel problem, in the lines somewhere, either your pump is faulty, low pressure, or there is a leak of some type, or your fuel rail is dodgy. Did you replace the fuel pump during conversion, if so, was it a new pump or a secondhand wrecker pump ?.
check the fuel pressure regulator, if this is heat sensitive and faulty it will most certainly act quicker than the ECU can compensate for, causing all sorts of psychotic reactions.
I had a fuel leak once, burst a hose, and what happened is that it thought it was getting fuel but it wasnt, and because the amount of fuel varied so much, the revs went up and down like crazy exactly as u described, and would then settle down (even though it dripped abit of fuel). as soon as the pressure (due to hose burst) was fixed, the problem immediately went away.
I say get a pressure gauge, and check the input and output, also check your fuel filter if you havent done so, and check the fuel pressure regulator, remove the vaccum from it to get max pressure and see if the problem goes away. After this check the operation of your injectors.
remember, if you poored fuel into your intake or drained fuel from the lines manually, this is what would happen, so whats causing it to do this ?....injectors or fuel pump. (or regulator).
Its possible the problem is electrical, but it would be continuity if this was the case, as if a sensor was faulty it would cause this problems at all times not intermittantly.
Hope this helps a little.