My buick bucks and actually acts like it wants to stall but as soon as i let off the gas iabd press down again it runs fine

I dont know if 89 Buicks are fuel injected or carburated. If it has a carburator, there may be a problem with the choke.

try a egr valve

Check fuel pressure it should be 41-47 with key on engine off more than likely this will be the problem.

my '93 f-250 (4.9L) stopped running while driving, now it acts like it isn't getting any fuel. Tried switching tanks, but still does the same. What would be the problem.

sounds like fuel psi issue check that when acting up could be bad fuel pump

Fuel filter

Check the fuel filter, plugs and wires. Either one of those could act like that if they need replacement

Injectors, even if one is bad, the increase in resistance in the SFI system kills the other injectors too. When it starts to run bad, unplug injectors one at a time to see if it runs better.

I recently tried the DIY service and repair manuals from a website and it actually helped me repair transmission problem in my jcb 3cx site-master. It would'nt move forward or reverse, engine was good both solenoids for forward and reverse worked, but still couldn't diagnose the problem.
I don't have much technical knowledge but I just followed it step-wise, and now it works perfect! covers wiring, codes, diagrams, torque specs, PCV, everything
got it from www.reliable-store.com

Is this a V6 VQ35 or 4 cylinder QR25?? If the check engine light is flashing the car is not running on all cylinders. Misfire detected by the ECM/computer. The code for the check engine light is going to be misfire code, that will tell you which cylinder misfired. Need more info as to which powertarin you have (V6 or 4 cylinder) They both have their own bugs. Let me know. Oh. and how many miles on it also.