I would first recomend to see if the plugs are fould. Also use a spark tester to see how good the spark is. What compression readings are you getting? Are you doing a new instal of the Haltech or was it already done? If already done is the map any good in it, is it dumping to much or too little fuel? Are you getting power to the ignighter? The list goes on, PM me if I can be of any help.