Im working on this car for a friend 90 Lumina 2.5 4cyl 140k.
The car starts and runs every time, never dies.
When you are driving along normally 40-55+mph the car will all of the sudden buck really hard about once every second or so, its very consistent. If you let off its stops, same if you give it gas.
I know the fuel filter has been replaced and that's really about it.
More or less hoping someone has dealt with this before and can help out quick. If not i know the drill haha
If you need more info i can get it to you guys. Thanks!!