[BNaylor]

With the fuel injector DTC revelation I would say or guess the fuel injector is suspect. The TPS is the throttle position sensor located at the throttle body and I would hold off on that and concentrate on the #3 fuel injector issue or replace it outright. Due to the design it is difficult to ohm out the fuel injector coil (11-12 ohms). It has to be done at the big electrical connector by the alternator which is all part of the fuel injector wiring harness. But you have to know what pins and color coded wires go to the respective fuel injector. To get to each individual injector you'll have to remove the upper intake manifold (UIM).