the car seems to be starving for fuel over 25 miles an hour when accelerating like vapor lock, problem occurred after putting gas in the tank after the change in unleaded gas to have ethanol mix. i never replaced the fuel pump or the fuel sending unit attached to the pump. the fuel gauge in the car will flutter up and down as you take corners or accelerate. this car was the first V6 gm vehicle to have distributorless ignition, which means it has coil packs(three of them to be exact) connected to a distribution block running directly to the computer, later used on the cadillac northstar V8. and yes it could be a simple ground issue. i said its most likely but not have to be those potential problems. i have a new car and i have no need to hold on to this one. that is why i am selling it.
specs:
3.4 litre 207 cubic inch twin dual overhead cam V6
iron block all aluminum headed with distributorless ignition
215 horse 215 foot pounds of torque
0-60 in 7.6 so they say more like 7
3300 pounds
.89 g skid pad