It is certainly possible that a sensor is not reading right and giving
you a very rich mix, and/or that the cold start valve might be getting
power when it shouldn't, or leaking, or that your fuel pressure is too high,
or that your injectors are leaking. One thing to do is to pull some
plugs and see how black they are, and if all are black.
There is lots of good info on the FI system at
http://www.icbm.org/erkson/ttt/engine/fuel_injection/d-jet.html


Year model might make a difference about the gas gauge but all of them
are subject to problems and will read high if the voltage regulator
for the gas gauge and temp gauge is not working right. Your clue will
be if the temp gauge always shows hot but the engine doesn't feel hot.

My 164 is a 69 with 281Kmiles. Have new clutch cable but have
not installed it yet.
--
George Downs, The "original" Walrus3, Bartlesville, Oklahoma