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anyone have any idea`s. starts cold immediately, warms up an then goes to one cylinder, bringing the revs up above idle it goes back on two pots but runs very lumpy, about 1800 rpm seems to keep it on two but then cuts out periodically, but always restarts immediately, just to cut out again. no warning lights, temps and presures good, dealers are suggesting changing parts on a hit and miss basis to find the fault, they say there is no diagnostic equip availble for this motor. thanks.

 

[DuckNut]

Pre-injection; I am assuming carbed?

Give the carbs a good cleaning. A very cheap and easy project and then you can rule that out.

Most of the issues with poor running seem to stem from fuel issues.