My 71 year old neighbor has a very nice always garaged 1989 Country Squire wagon 5.0 with AOD. It has 87,000 miles on it. He was complaining that it has been doing strange things, so I took it out for a drive. It starts right up and throttle is responsive and it pulls well, but when its in third or overdrive it has a huge deadspot in the throttle.
When you get the gas pedal half way down it downshifts and goes. When its in first or second it is very responsive and I am sure its not slipping in third It just has a dead pedal. Any thoughts? I put a code reader on it and it has no codes and no check engine lite. Thanks