77 is fuel system lean and the rest might come from stalling
43 is cylinder misfire on that year jeep might have a melted harness issue based on the first
2 codes wityh voltage high

M Lee wrote:

> I was driving my 1996 Larado GC 6 cyl in town yesterday when the "Check
> Engine Light" came on and the engine suddenly began running very rough
> and stalling. I managed to get home but the jeep is hurtin' .
>
> Per my Haynes manual I used the on/off on/off on/off ignition key
> routine to generate the error code(s) but the resulting multiple error
> codes left me scratching my head. Could someone help me interpret the
> following?
>
> Code 12 - Problem with battery connection. Direct battery input to
> controller disconnected within the last 50 ignition key-ons.
>
> The battery has not been disconnected so this is a mystery.
>
> Code 14 - MAP sensor circuit open or shorted; voltage too low
>
> What and where is the "MAP sensor circuit" and how may I test it?
>
> Code 34 - Speed control vacuum or vent solenoid circuits open or shorted.
>
> Where are the Speed control vacuum and vent solenoid and how may I
> test them?
>
> Code 43 - Peak primary coil current not achieved with max dwell time
> OR
> Cylinder misfire
> OR
> Problem in power module to logic module interface
>
> This may have simply been generated because the cylinders were
> misfiring quite frequently while the car war running.
>
> Code 77 - The Haynes manual does not indicate the meaning of this error
> code.
>
> Could anyone tell me what this code means?
>
> Code 55 - According to Haynes this code simply means that the computer
> has finished displaying all the codes.
>
> I'm reduced to riding my bicycle in the Florida heat so any help would
> be greatly appreciated.
>
> Best Regards,
>
> Marcel