tested for vacuum leaks? CO, Timing etc.. set correctly, will hunt if CO is not right

Also ISV control module (controls the ISV!!!!) located under steering wheel, or thereabouts depends if someone has moved it when fitting alarms etc... Try and find one on ebay cost it will cost a fortune new from stealers!
I also changed hall sender, as mine kept cutting out when you dipped the clutch, all OK now - Touch wood!!!