'91 Accord LX 4 cyl. 5 spd. 127K miles - runs fine most of the time but it's not pushed hard. When it gets up around 5000 RPM it cuts out (feels like it dies suddenly, but ultimately keeps running) and shows the CEL. The light goes off when the key is turned off and the engine restarted. The ECM gives me a code 4, which points to the crank position sensor. The driver usually shifts at 3500-4000 so he doesn't usually get the problem, but occassionally it will do the same thing at lower RPM, or even when just holding speed in a lower gear.

Is this an indicator of the timing belt getting sloppy? I don't know for certain when the belt was changed (second owner). I just fixed an ignition problem (ignitor) but this problem has been around since before that one. My thought is that if the belt is just a little sloppy (or stretching), the crank position sensor will give a fault indication when the belt gets stretched. Am I off track? Any ideas?