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My 89 740 GL starts and idles fine, and when I rev it to 1500 rpms, and hold it there, it does fine. However, when I rev it to 2000 rpms the gage immediately starts to bounce down to between 750 and 1250 and back up to 2000. If I let off the pedal then it idles smoothly down to about 900. If I try to drive it, as I accelerate the engine seems to turn off then a fraction of a second later turn back on again. It does this about every second or so, and upon releasing the pedal it goes smoothly to idle. The car has 295,000 miles and a very bad rear main seal oil leak. The new things on car include rpm sensor, distributor, cap, rotor, plug wires, and engine temperature sensor. Things that I have swapped from a salvage volvo, and thus not guaranteed to work, include ignition amplifier, knock sensor, and radio suppression relay, and coil. The OBD codes come up good except when testing throttle position sensor (TPS); I am supposed to get a 3-3-3 when releasing the throttle from full throttle, but I get a 3-3-2. I adjusted the TPS according to Brickboard, and still get that 3-3-2. Flame trap and throttle body are clean. I still get the bouncing rpm. If anybody can point me in the right direction, I would greatly appreciate it. Thanks!
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