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Message: <blockquote data-quote="leforte" data-source="post: 290620" data-attributes="member: 1943">adding octane booster is just a temporary fixed. the ess tuning works ok for a number of cars using even regular fuel, with only a lack of power being the only drawback when the ignition timing is pulled/reduce to counter knocking. there are many other variables that could cause knocking ie:- lean AFR, MAF failure, O2 failure ...my first guess its highly likely there is a leak somewhere upstream of the SC which is leaking in unmetered air that will lean out your fuel mixture and the DME will just pull/reduce the timing to counter that. my second guess would be the metering system, since it requires the MAF element to be transfer to another housing, and it does not have the original grated mesh  before the heating element, the MAF may not work accurately. the grated mesh is there to straighten the airflow for a precise air measurement. without it, some unmetered air might be flowing pass it. hence the knock. the jerk may be from the sudden timing pull/reduction in the event of engine knocking.</blockquote>