Hi, I have a 1975 chev. Nova and I have noticed recently after turning the ignition key off the engine keeps running off for a second or two, I call it engine run off but I'm not sure if that is the correct term. It does not happen everytime but often enough to concern me. Any advice on the matter will be most appreciated. I will replace the timing gears soon, I wonder if this problem could be associated with timing gear problems, my car tends to reach a higher temp faster that it did before, particularly when going up hill. I'm giving details of the problems I'm having to give you and idea if all the problems are related with worn out timing gears, or else. Thanks for any help.