Everything you described could be caused by the charging system, especially if the generator has one bad diode. That will cause it to develop a maximum of exactly one third of it is rated current, which might be just enough to keep up with the demands of the electrical system, but the resulting excessive "ripple" voltage can interfere with computer sensor signals.
A quick test is to fully charge the battery, then, while the engine is running, unplug the smaller wires going to the generator. If the symptoms clear up or change, have the charging system professionally load-tested.
SPONSORED LINKS
Thursday, February 23rd, 2017 AT 6:39 PM