I am having problems with the portion of the wiring harness neat the ECU on my 1985 240 wagon . Every once in while I will loose spark . I first though it was hall sensor problem but all of that checked fine and have cleaned all contacts and fuse connections repeatedly. By accident I have found that jiggling the wiring harness from the ECU near the engine (behind the alternator) gets things going again - I bet it is shorting agains the engine or body . I looks like I have finally isolated the problem . The last time I igggled it (on a cold day ) the black covering split open . I would like to remove all the covering in this area and repair as necessary if I can't find a Pick-a-part section from a 1998+ model replace it with . What material ( and where do it get it ) do I recover it with ? - thanks