When I started my car today the engine wouldn't idle right. It would surge to 2000 rpms and then almost die. It did that till I held it at 2000 rpms for a little while then idled ok. The air pump was also cycling on and off. I did some errands it ran good although the radio would come on and go off on its own and I had no cruise. I got code 15 from the built in diagnostic module(injector,cylinder 2) and a code 49 from pin 8(voltage supply at engine control module implausible/low volts)
Would pin 8 code point to a bad alternator?
would the built in module code point to a bad injector.
Thanks for any input.