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I'm having the same Espar M2 B4L heater problems at elevation. Works great below 5000', struggles at 7000' - spits and spudders a lot and barely runs, at 9000' it wont run at all. I'm Taking my Transit in to have the 2mm standpipe installed as per the Esparparts.com Tech. R. Lawrence suggests. Taking the van in next Thursday. Who knows.....I hope this helps.