What sort rpm-s car should do when driving 60 mph. Or even better if you can tell 3rd and 4th gear rpm-s. My tacho doesn't work always, usually when starting up, it might take couple of minutes till it awakes. Any ideas? And third is car has died suddenly(only 3 times in a month), when stationary in traffic and in D or 2. Restarts without problem. And revs are going up and down when engine has warmed up, I read about it from v8sho, but can someone tell me what's the fix.