We have a 97 legacy that is gutless but no check engine lights. It will only go 20 mph up hill. When you throttle it from a stop the engine sounds hollow and slow. You get up to speed and it seems ok until you hit a hill and it downshifts and it sounds hollow again. Kinda like it’s running retarded. We changed the fuel filter but not the fuel pump?
Is there any ideas? Is there anything that would cause it to run retarded? Failing fuel pump?
The hard thing is that it passes emissions and has no check engine lights.
I do know the previous owner blew a head gasket and had it replaced with the cat (which had a CEL).
Any issues that could cause this problem but not throw a CEL?
