are u running the recommended premium gas for that jeep with the 5.9and
when was the last time you changed the fuel filter???

wrote:

> My 98 5.9 grand cherokee started acting odd yesterday. Occasionally,
> from a stop it would be real sluggish about taking off and sounded a
> bit odd...almost like it wasn't getting enough gas. Then it drove ok
> for a while, shut it off and started it back up. CE light was on so I
> pulled the codes. I got these:
>
> PO726 The PCM has detected that the voltage signal from the engine
> speed input is out of range for the current engine operating
> conditions.
>
> And:
>
> P1281 Injection control pressure out of range high.
>
> Any ideas?
>
> Never came acroos anything that involved before, usually simple stuff
> that I can diagnose right away, but I'm kind of aprehensive about
> driving it without knowing what's going on.
>
> Any help is GREATLY appreciated.
> TIA
>
> Mikhail