Taking the ALDA off completely, first, is easier diagnostic step than trying to adjust it (possibly breaking it).

I don't get how less power and more consumption go together unless there is new resistance in the equation somewhere - like severe wheel alignment issue. (Rear toe-in? Always driving up an constant incline both ways to school in a snow storm...?)

Barring that it sounds like fuel quality (lower energy), or a mucked up IP - squirting at the wrong time. Does it knock? Blow grey smoke?

You say refreshed timing chain... did they get the timing right?

__________________
Cheers!
Scott McPhee

1987 300D