Thank you for you input Joey,, But after a engine diagnostic check, we determined that it was a oxygen sensor, and a miss fire on the second cylinder. So I'll start by replacing the plugs and cleaning the O2 sensors to see if that clears it up,, I don't want to replace the plug wires right yet, because that looks like that's gonna be a major operation. Also,I'm not sure if the gas treatment had anything to do with the problem, but I don't think I'll be using gas additives again in my Land Rover,,, Thanks again
Robb
Robb