Check the fuel pressure and start from there, if this is a CPFI engine the
regulator could be leaking, located inside the upper plenum.

Wholly Full Open?  Wide Fu**ing Open?

That's often an indication that a major input sensor is bad -- MAP,
TPS, CTS, etc...  If this observation holds true in every instance,
then I would check sensor input readings on a scan tool first to
quickly rule that possibility out.

Otherwise, you could be experiencing overfueling due to a stuck open
injector poppet (there's one for each cylinder) as the code 45 would
indicate, or as Shep suggested, a flaky regulator.

If the regulator or any of the plastic spider lines were to leak under
the manifold, or if a/several poppet(s) were sticking closed (common
problems) the truck could run like crap but I can't see why you would
get a rich code without another unrelated problem.  Of course it is
early in the morning and my thought processes have yet to receive a
needed kickstart.....

Toyota MDT in MO

I've had to replace the ignition control module on my car twice. It caused
fast idle, bucking, and random stalling. They can be removed from inside
the distributor and taken to some parts stores where they will test for
free so it's a pretty easy one to eliminate. Mine had a 5 year 50k km
replacement warranty. If replacing I'd recommend bedding in a bit of
thermal dielectic grease from an electronics store, the stuff they bed
computer CPU's in. One packet costs $1 here. I think dry bedding by a
mechanic caused my first replacement to burn out.

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