The flex plate has a timing reluctor ring attached and two pins that must be in faze with #1 piston on the compression stroke.pin must be ~15* below horizon oposite starter.
A flex plate is the plate that is bolted one the back of the engine that the torque convertor bolts on to. I dont see how the flex plate would have anything to do with how the car runs. i would check the timing, plug wires, and maybe vacuum lines.
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If the engine will rev up to 5 or 6 thousand RPM's without hesitation and backfiring your timing should be fine. If you removed any spark plug wires be sure that you have the order correct. If you replaced the engine as a whole, including all of the sensors you may have an engine that ran off of a different computer. Volvo 740's had 2 or three different models of engine computers. Please tell us what exactly was replaced and what wasnt replaced. Were the motors the same? (Both 8 valve, both 16 valve) Were spark plugs, timing belt, distributor replaced or swapped?
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