Phil if you have had a battery fall below 10.8 volts while the engine is running you will almost certainly see that the ignition curve has gone haywire. It will now look like a heart rate monitor.

You can check you sensors with an ohm meter. Disconnect one and put a ohm meter lead on each pin. You should have between 100-130 ohms. While you are checking them wriggle the wires around as well to see If that effects it. Then do the same for the other sensor.

Also check the sensor tip has not been damage by a rock or anything. Gap between the sensor and the wheel should be .060"-.080".

If you have any questions or are unsure of anything let me know I will give you my number and go through it with you.

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