If timing is the problem, could be your timing device is not doing it's job. My Xenon timing light/ RIV Adapter will easily tell you if that is the problem or not.

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Timing Light Video by funola | Photobucket

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked