Did the air flow sensor turn out to be o.k. ? If this is a potentiometer type, there is a possibility that there is an open circuit at certain section of the pot contact. With car off, when the air flow sensor is at the top, the resistance should be between 1 and 2K. Now if you gradually depress the plate, the resistance should gradually increase, there should be no jumps greater than 4K. If for certain position of the plate, the sensor resistance is unreliable, you could get hesitation for those positions. Maybe, disconnecting the temp sensor puts your car in limp mode (this thing is car specific, and I dont know about your car) ? And in this mode, the air/fuel ratio is controlled in an open loop maner by the computer, no sensors are read, and this actually tells you that the problem is in one of the sensors. The other possibility is if the position sensor is giving unreliable signal around those rpms. I cannot upload the manual's pages that outline steps to test electrical components of the KE system, send me an email at
saumil@swbell.net if you dont have these steps and need them.