Unwanted output signal jitter

[LinkMTech]

Hello everyone,
First of all, thank you all for sharing your time and wisdom so others can excel.

I'm making a fuel injection circuit using the PIC16F737 that would allow me to control the outputs ON/OFF +/-. After gleaning the data specs on my part for understanding and researching this forum to get me this far plus experimentally trying different ideas, I hoped that an expert would be able to spot why I'm experiencing this unwanted signal jitter.
Attached are:
1. Copy of sample code working just one input. You'll notice that the ADC settings are not the usual settings but were left this way because I got a nicer response from the pot control. This might also be the band aid to the problem.

2. Scope screen shot of ouput signal with ON time delayed and with unwanted jitter at opposite end. If I turn the pot CCW from center, the output turn ON delay is increased from 0 to 500us.

3. Scope screen shot of ouput signal with OFF time delayed and with unwanted jitter at opposite end. If I turn the pot CW from center, the output turn OFF delay is increased from 0 to 500us.
The top trace (Yellow) is the input, bottom trace (Blue) is the output.

Input signal is 5V with 2.5ms LOW pulse and 20K pull up, pot is a 5K from 5V to GND. Output driving a current limited LED at the moment.