I have an 87 V6 Pathfinder with auto trans. Recently when cold, I had to manual shift if for a few miles until I built up some heat in the motor and trans, then if shifted normally. This has been going on for about a month now, then today I noticed it wouldn't shift into 2nd and 3rd (3 speed) until I get off the gas and almost let it idle into the next gear. Driving up a steep hill it would down shift into 2nd but wouldn't engage 3rd when enough speed was built up until I backed off the gas but then there would be very little power to climb the hill in 3rd.
After reading the cheesy Chilton manual, I suspect the modulator or vacuum line (if there is one, I couldn't see squat from the engine compartment, too many things in the way). I'll just crawl under it at a later date to see if any vacuum lines are going down to the trans.
Anyone familiar with this setup? It is a 4 wheel drive with auto hubs. Thanks in advance for any possible help!