Can LT vibratations cause a stumble from 20+ sometimes it stops and sometimes it doesnt i have dynomax header mufflers and they are just bolted on and constantly smack the bottom of the car, can this be a problem too maybe something with the Knock sensor or something retarding it?

 

no one has a thought?

 

yeah, try the lt4 knock module and try to fix the exhaust problem, sounds like it's pullin timing to me

 

because i have changed the wires plugs i mean i dont think its the opti or anythign because it idles fine and all that just will smooth in and smooth out ? lol