i noticed the number one, or the closest plug to the front of the car; the wire was a little stripped by the connection to the glowplug itself and it was touching the intake manifold, could this cause the problem? im looking for a new paper clip to test it.

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1985 mercedes benz 300D turbo diesel
1998 VW GTI VR6
1996 VW GTI 2.0
1999 saab 9-3 turbo
1987 300sdl (sold)