Cadillac Repair: 1990 caddy fleetwood, fuel pressure gage, throtle body

Question
Hi, i have a 1990 caddy, fleetwood, 4.5l fwd, the car sometimes hesitases, n if i was to give it a shot of gas it will stall. i cleaned out the throtle body n it helped for a weel but then same problem. if i am on the highway doing abt 70klm n i push the gas to exceed to 100 i will feel the engine tryin to stall n hesitate. any help please.

Answer
It is difficult to set here and try and give you an answer without driving the vehicle.

The first thing I would do is to put an external fuel pressure gage on the fuel rail and tape it to the outside of the widshield and drive the car and watch the fuel pressure when you get this problem and see if the fuel pressure starts to drop.