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