i will keep on waiting, and wish to add that the vehicle has automatic transmission
it often behaves perfectly, but sometimes won't, even when cruising at 60 mph on motorway. My question is, where is the o/d control unit located in this vehicle?
I have already changed the coolant temp sensor, and the a/t switch. Each of these resulted in a cure for a few days, then back to its old habits. But thanks for your advice, I will get the ECM/TCM checked.
hi greg, the diagnostic check revealed malfunction code 11, the throttle position sensor. I have replaced this item today, and the overdrive has behaved properly since. I am very grateful for your help. Best wishes, Keith