Have you had the catyltic converter checked? Sounds like it might be blocked. Get a vacuum gage and conect it to a good vacuum source and hold the idle speed at about 2500 rpms and watch the gage ,if it drops slowly the converter is blocked. You might also want to check your transmission oil. If it isn't circulating properly you might be burning the bands on your transmission with the resistance of going up hill.
Plugged fuel filter, air filter, Restricted catalytic converter,
Once you have achieved highway speed, you would stay in the highest gear, except for steep uphill or downhill grades.
try changing the fuel filter
i'd check the plugs. Thanks I changed the plugs Still doing it i seems like its not getting the gas it needs to go uphill or to speed up i thought it might be bad gas or a fuel filter Could that be it please help EGR valve will do that and so will early problems with the cam shaft position sensor.
It is most likely just the fuel filter that needs to be replaced.
My 92 5.7 had a similar issue. Changed the plugs, wires, distributor, fuel filter, air filter, coil, checked for vac leaks - nope. still there. Then the guy at Autozone who also had a 5.7 said it may be the EGR valve - a built in vac leak when they go. Yes - that fixed the problem.
You Probably Don't have enough refrigerant in the system. they sell R-134A cans at your local auto parts store for about $20 DO NOT OVERFILL IT.
Check and check.Going uphill causes an increased engine workload, try downshifting your gears. it it doesn't work, have your clutch checked.
take a fuel pressure reading. Its most likely that your fuel pump is weak.
Weak transmission pump? Try changing fluid and filter
Gravity. Or your fuel pump is bad. There should be enough pressure from your fuel pump to push the fuel to the injectors. A clogged filter could do it also. I would change the filter first.
Uphill Battle ended in 2005.