MY 2000 JEEP WITH 4.7 ENGINE,IT WILL RUN GOOD WITH ZERO CODES.THEN ALL AF A SUDDEN ,IT BEGINS TO SURGE,GOING UP TO 2000RPM AND DOWN THEN UP AGAIN.WHEN I CHECK THE CODES AGAIN,THERE WILL BE CODES READING LIKE 202,207,208 WHICH READS -INJECTOR CIRCUIT OPEN,IT HAPPENS EVERY TIME,WHATY IS HAPPENING,PLEASE REPLY

SOURCE: 2002 jeep cheroke misfires on cylinder #4

Check intake gasket and vecuum hoses near intake runner #4. To do this spray carb cleaner at parting line between manifold and block while engine is running. If leaking rpm will dramatically change. A leak will lean out that cyl and cause misfire

SOURCE: jeep will just die going down doad or will not start, had a code that read camchaft sensor replaced that still the same, now i have a code that reads injector circuit malfunction i mhave changed fuel

That sounds like a bad grounding wire, or possible PCM malfunction. Check all engine wiring harness locations for any corrosion or damage. let me know what engine type you have, and I could look up the wiring schematics

SOURCE: pcm

first is check fuses, if none bad it's a bad pcm

SOURCE: i have a jeep cherokee 01 and the check engine

tinyp78 has it right if it has the check engine light on then don't run it as it will damage the catalytic converter, as well if the injector fails and exlodes the parts can go into engine and damage a valve or cylinder.

SOURCE: 2000 jeep cherokee laredo - Check engine light

Could be a vacuum issue or the modulator..

The modulator tells it when to shift and is controlled by vacuum presure..
Check all vacuum lines that rum from the tranie for cracks, spits etc..

it could also be a sensor..

Hope this helps !!
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