I'm having the same problem as well. The part 22120-N4202 is no longer available anywhere. I've talked to a couple of techs that know these cars well and suggested to plug the switch off. The purpose of the switch is to switch between the dual points in the distributor as the car warms up. The 75 and 76 are the only cars that use this switch and was later was discontinued on the 77 and 78 280s. As mentioned in http://www.classiczcars.com/forums/s...ad.php?t=35873, you could change out to a 280zx distributor to resolve the problem. The other option is to purchase the 260z water temperature switch that MSA sells and redo the wired ends to match the 75 and 76 switch. The ends can be easily change out using a male bullet connector and insulator and a ground connector on the other terminal. Another suggestion from techs are to use a fan switch, but you need to make sure that the switch will switch over after the car warms up past 100 degrees or less. Not sure on how accurate that would be, and if you could find a switch that would be that low on the temperature to switch, but I guess it's worth a try, plus it's lot less expensive than the MSA part. I'm thinking of going with the MSA option and redoing the connections at this point.