Ok, I just bought a 95 Z28 Saturday. When I got it the low coolant light was on. I checked the coolant and it was fine. I also changed the thermo. Next at idle or under slow acceleration it is kinda rough, but if you give full throttle it smoothes out. The plugs have been changed but not the wires. Car has 122k on it.

Any help would be greatly appreciated.

 

low coolant sensor is bad or dirty, just unplug it and the light will go away with no side affects (other than not knowing if the coolant actually is low). a replacement is around $25-30. it is located on the battery side of the radiator, just under the filler cap. it's a small square thing i beleive.

as for the stumble. replace the wires and see if that fixes it. 122k on stock wires, you could have a dryrotted boot or a burn.

 

link to another post today about same problem, with pics