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76 240D biodiesel poor acceleration

I've been running 100 percent bio in a 76 MB 240D, just fine for a couple months now, but it's starting to get cold in Oklahoma. Recently I've noticed significant hesitation when trying to accelerate in 3rd and 4th and sometimes at the top end of 2nd. But it doesn't do it on all trips -- just off and on. Is this likely from clogged filters or could it be the injectors? I installed the Monark fine-mist injectors several months ago, and it's been running fine until recently.

Jason, Tulsa OK

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1976 300D Wont change from A/C to heater

I am about to fix a 1976 300D that does not change over to heat when you turn the A/C off. We bought it from a dealer and know very little of the car's maintenance/repair history. I can tell that the car was well maintained and runs/drives great. The heater slide controls are working, but whatever is supposed to happen when you turn the A/C knob fully counter clockwise is not functioning. I was wondering if anybody knew of a common problem that I should look for when I repairing this.

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