There is no pulse in the injectors
Okay allow me..have you tested (test light) the lines leading to the injectors to determine if they are getting fire? Next if you do not have a test light, you can disconnect the fuel rail from the intake just high enough to place ( I use cardboard ) beneath the injectors to determine if fuel is getting through. These vehicles also have a couple of fuel relays. If the previous suggests gets you no where I suggest you have the relays checked.
Search Buick Riviera Questions
Buick Riviera Experts