FiTech EFI Tuning Forum MenuForum NavigationForumMembersActivityLoginRegisterForum breadcrumbs - You are here:ForumUltimate LS systems: LS usersSpark knockPlease Login or Register to create posts and topics.Spark knocktytrafelet@tytrafelet1 PostMembers#1 · July 26, 2019, 8:42 amQuote from tytrafelet on July 26, 2019, 8:42 amI can’t get my 5.3 to run smoothly. Did play with the spark map some and got it better some but it always seems to come back a lil. Just not sure the map is where I want it. Needs some pointers maybe what other people got theirs at. Or other things to adjust too I can’t get my 5.3 to run smoothly. Did play with the spark map some and got it better some but it always seems to come back a lil. Just not sure the map is where I want it. Needs some pointers maybe what other people got theirs at. Or other things to adjust too Post Reply: Spark knock Cancel