My car is also a 2003 BiFuel, now with 164K miles, and on its third stepper motor in 9 years. The present one I just had supplied from CNG BiFuel, and the usual engine cutout problem which recently started has gone. Having followed these threads now for some time, I'm happy to recommend CNG's modified stepper motor. The first time I had the stepper replaced, I was told by an independent lpg garage that they only last a few years, and he was right. I'm grateful to CNG for taking the time to look into this problem.
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