My Bonneville SOMETIMES hesitates when accelerating from a dead stop. It feels like it is either not getting enough gas or not enough ignition advance. Here are some facts:

Any ideas?

When was the last tune up of plug, wires etc?
Have you ever removed and cleaned the throttle body?
What plugs/wires are currently on the car?

My '95 FSM gives these possibilities for hesitation: ('98 FSM may be different?)

TPS or wiring
Oxygen sensor
Fuel pressure
Contaminated fuel
EVAP canister purge system
Fuel injectors
Spark plugs, wires
Ignition system ground (ICM mounting bolts)
Correct PROM
Thermostat proper heat range and functioning
Air leaks between MAF sensor and throttle body

Good questions. Here are some answers:

Honestly..

It could easily be wires and plugs. Bosch doesn't work well on a waste spark system. (Good read around here recently). At the least..I'd be inclined to have you pull the plugs and check them.

Edit: Bosch info is imbedded in this thread.
http://www.bonnevilleclub.com/forum/...c.php?p=765279

Does it also do it when you just give it a little gas when you first take off?

and does it do it if you hold the brake and give it just a bit of gas?

if so, you might have had the same problem as me, it was the EGR.

Psst..Don.. the plugs are AC.. wires are Bosch..

The plugs are not Bosch, but the plug wires are.

The plugs are AC 41-921. They look OK, but are quite old.

Bandit, I have not tried holding the brake and giving it gas, but it does it with just a little or a lot of gas pedal.

I just replaced the EGR too about 1k miles, along with a new o-ring.

Billboost; I read the thread you refered to. Since my Bonny is normally aspirated it appears that I can go with any of the plugs. What would you recommend?

If you are looking for a longer maintenance schedule the Iridiums. If you want lower cost..TR55'* or AC Delco copper equivalents.