MY subaru legacy 96 was stalling when i shift to drive and the rpm was playing on 1400-2000,, i change the ignition coil, high tension wire and tps,, but it always stall when i shift to drive,, 

Does it ever start not want to start?

does it idle OK?

any backfiring?

Th transmission/torque convertor could be the source of the problem. 

 

Idle rpms seems high to me. 

It start,, Idle is ok,, but when i accelerate theres a time that the engine was hesitating,, i cant drive it even it is partialy inclined road,, or even i hang it,, it always surge when it comes to drive shift, 

 Could the fuel pump give this kind of prob at the engine? 

When i shift to drive, and the rpm reach almost 2000, it fluctuates down 1400- 2000, and it can't reach higher than 2000 rpm,, 

double check crank/cam timing, maybe off a tooth ?

A few basics first. How many miles are on it, what recent work has been done, and is it an auto?

 

How is the fuel pump pressure?