Have your ignition module and switch checked. I had the same problem and that was the answer.
i have changed all my bulbs for a 1994 Bonneville still i have no tail lights for nite driving
it is illegal to remove a catalytic converter.
I have changed the fuel pump on my 1993 Pontic Bonneville, it still is stalling any clues why? could be Fuel Pressure Regulator http://www.youtube.com/watch?v=AKtR_yF7bi8&feature=related
Have you changed the fuel filter lately?
Have you had the catyltic converter checked? Sounds like it might be blocked. Get a vacuum gage and conect it to a good vacuum source and hold the idle speed at about 2500 rpms and watch the gage ,if it drops slowly the converter is blocked. You might also want to check your transmission oil. If it isn't circulating properly you might be burning the bands on your transmission with the resistance of going up hill.
A 1996 Pontiac Bonneville requires 5.7 quarts of oil in the crankcase. The oil filter should also be changed with the oil.
2 years
Fuel injectors or coil
Might be turn signal flasher
If the catalytic converter is defective more than likely the O2 sensor is defective.
Try XE.com converter.
bad torque converter .