Need help code p0251!!
 

Last year about this time I changed the PMD thanks to your feedback, no problems until about a week ago. Van is bucking, sometimes hard start, and sometimes feels like it has no power to go up hills. I have changed the fuel filter and put in a new PMD. Van starts sometimes quickly sometime hard to start. The glow plug light will go on and off like a blinker and I also hear a clicking each time. Any ideas or suggestions.

Thanks Alex