There is no lambda sensor on this car, I have checked the wiring back to the ecu, signals at the ecu are the same as they are at the sensor.

Checked for leaks on all vacuum hoses, checked with a vacuum pump, have a vacuum gauge inline with the map sensor and that is showing apropriate readings dependent upon throttle position.

Engine runs fine at idle, if you raise the revs really, really slowly, it is fine, but imposible to drive like that, only a problem when you open the throttle normally.

With the emmisions tester connected the emmissions are all a bit high, but nothing that I see as a real problem, so that would also rule out vacuum leaks.

Any more ieas or any experts I can get some help from?

Thanks

Eric