1391 CPS trouble

I keep getting a trouble code 1391, intermittent loss of cps. Vehicle runs great, both crank and cam position sensors were replaced with known good units. any ideas?

Always post year/engine.

I would get a can of electrical contact cleaner (available anywhere, even WalMart) Thoroughly clean the 3 associated connectors with both the cam and crank sensor. Add a small dab of dielectric grease to these connectors before reconnecting.

1. Connector at the crank sensor itself
2. Connector for the crank sensor under the hood near the #6 injector / firewall
3. Connector to the camshaft position sensor