1988 Bucking

[jamesrr]

I hava an 88 gmc suburban w/5.7l v-8. and recently it began bucking
during accelaration. This problem seems intermittent as sometimes it runs fine. I suspect fuel pump but before I drop the tank, I was hoping for maybe another idea.
As I begin to accelarate it will run fine untill the pedal is about 25% pressed then it starts to miss, not one cyl but like the key is disconnected for a split second. If I back off the pedal it quits. If I press the pedal further it pops and sputters then races.
Any ideas please help

[dirty dan]

If bucking is fairly hard, it could be your torque converter failing. Common on that vintage.

[Firminator]

Are you certain that your fuel pump is in the tank? On my 86 Chevy Suburban the fuel pump is mounted on the engine, not it the tank. I think Suburbans may have changed significantly between 87 and 88 so yours might very well be in the tank. What I can tell you for certain is that I get very similar bucking when the fuel pump is in the process of failing, which is often a slow death. This I know well because I've replaced the fuel pump at least three times. The fact that this thing eats fuel pumps is one of my very few complaints about the vehicle.