Bought (my 5th) z for my wife, its a 77 280z with FI. The problem is when the car is driven and the rpm rises above 1500 i can take my foot off the gas and throw it in neutral and the rmps continue to rise to 2000-2500. It does this every time. Between shifts its stays at 2000+... when i come to a stop it stay up at 2000+ for about 10+ seconds then suddenly comes down to the proper idle 0f 800.
I can not get it to do this when the car is not moving from under the hood or by pressing the gas from inside the car when the car is not moving. I have lubed the linkage, installed a stiffer spring. tightened all the hoses and tubes.
The very strange part is that it only happens when the car is moving...hmmm
Any ideas?
Thanks, Bob