gravity
I have an 88 EFI truck and it loses speed (not necessarily power) going up hills because it is a manual transmission and it is geared low... and also if you are in higher altitude. Mountains ect..the electronic fuel injection may need to be redone.
Fuel Pump problem or clogged converter
The first possibility is the fuel pump. The other problem may be that the vacuum hose has came off this would cause a substantial loss of power as well.
cat converter is getting plugged
It loses power because going uphill is harder then going downhill therefore causing it to use more gas and then making it lose power bit by bit.
Just had a rebuilt transmission still have no power going up hill
I had this problem several times and brought it to my mechanic. He informed me that the clutch was going bad thus resulting in a loss of power. Fixed the clutch and my problem dissappeared!
because it hits shore and loses power or has be going on for a long time.
The # one problem with today's cars is fuel pumps ; this sounds like one.As the pump gets warm,it loses power. Do have it checked out.
could be an alternator
When your truck loses power, the ABS system loses power.