At a stop on a hill, give it gas and it doesnt move. What can cause this?

run the fault codes and see which sensors are causing the problem

If it has high mileage on it probably is the catalytic converter is stopped up. A dead give away is losing power going up hills and not shifting like it used to. A easy test is to put your hand over the exhaust pipe wear a glove as it may be hot. Then have a friend give it gas if it is stopped up you will be able to hold the exhaust from coming out. That is just a simple test but more then likely it is stopped up . You can get a after market cat for about half the price of a new one . Good luck.

Maybe catalytic converter

MyNiss. 88 fwd tk.was doing than after, tuneup.Ihad crossed vaccum lines on air breather.

does the engine idle smoothly? is the service engine soon light on? the engine is running rich causing the blue smoke.it could be pcv valve but unlikely

sounds like you torque converter went in the transmission
hope this helps
give feedback

tow mode gives ur transmission a longer shift point to relive strain on engine while driving -it doesnt give it more horse power to start off a hill

Check gearbox oil

you need transmission fluid and your axle is broken

from the info you have given sounds like a fuel system problem generally , in general terms the fuel trim figures are way out. if the fuel trims are plus or minus more than ten percent then the fuel air mixture is out .what could it be ? well the most common fault is a faulty air mass sensor.other causes are vacuum leaks or a sudden drop in fuel pressure.diagnosing the causes is a job for an experienced tech with some test equipment unfortunately the code reader doesnt give all the answers.as far as it goes hope this has been of some help to you