clogged exhaust maybe?
did you hook a vacuum gauge to the intake manifold to see what it reads?

Bad distributor rotor/cap, weak ign coil?
clogged vacuum tube/hose to MAF sensor?

did you check the fuel pressure with a cheapie tire gauge or fuel pressure
gauge? BE CAREFUL and use common sense please!!!

is this a USA model or an import to you?
--
later,
dave AKA vwdoc1

> wrote in message
oups.com...
> Almost giving up..
>
> Renix ECU (replaced couple of years ago with Bendix)Multi point fuel
> injection, 4.0 litre inline six with manual transmission, 110K miles.
> It has been doing this over a year now,it feels like this Jeep has a
> mind of it's own...sometimes good day,sometimes bad day (mostly bad
> days recently).
> Problem is, that sometimes it just dont run over 1500rpm, it doesnt
> matter how much i press
> the gas pedal,it just sputters and rpm gauge drops to zero,it does not
> matter what gear i'm using,if i depress the gas pedal slightly then it
> keeps going slowly and rpm gauge comes back alive.
>
> But when it runs fine it really runs like it should (almost like a
> sportscar)..
>
> CPS sensor is brand new and giving nice pulses,O2 sensor is brand
> new,TPS sensor is giving smooth voltage,coolant temperature sensor is
> ok,manifold air temperature sensor is ok,MAP sensor seems to be ok,EGR
> seems to work, stator in the distributor is giving nice pulses,fuel
> pump ballast resistor is 1 ohm, (every sensor checked according to Jeep
> Renix Fuel Injection Manual) i have checked the sensors using digital
> multimeter (and oscilloscope for pulse giving sensors). I have done
> measurements near to ECU connectors (by cutting/peeling the wires).
> One strange thing is, that there is no noticeable difference if knock
> sensor wires are connected or not.. and it it was also giving knock
> pulses..more rpms,more and higher pulses. Basically my question is,what
> should i try next...
> could this problem be fuel related ?
> what are the reasons which can make rpm gauge drop to zero?
> For me it just seems to be electrical...i dont know anymore..
>
> Please answer if someone have a clue about this.
>