scared to drive it/please, help with advice...

[cfan10]

OK, what are the signs of a failing fuel pump. Yesterday I was on the HOV (Houston folks know) and it kinda died, noticed it would not pick up any speed...luckily I was near a exit, and was able to coax it off, I put it back in park and it started right up. Made it almost home and it did it again, but started right back up. Not sure if it matters but I did a plug change the day before, but the last two of the plugs closest to the firewall on passenger side would not come out, so there still in there. Does this sound like a fuel pump failure. Its been daily driven without any major issues. But this was downright scary. I'm ready to throw in a towel. As always thanks for your time, it is greatly appreciated.

90 suburban 350tbi (previous owner says he changed engine, and fuel pump) I have no way of knowing.