I've got an NA kswap in an eg. no engine codes. On and off throttle is like riding a bull. Doesn't begin to drive smooth unless i dump about 3k-3.5k of rpm in to it from a stand still. Also, when moving, i have to be at least accelerating to keep it from bucking. as soon as im off throttle at speed, it'll buck pretty bad. it wont drive even the slightest bit smooth just cruising around unless I'm putting power down. But under medium to full bore acceleration, it goes. smooth too. Being a novice at anything tuning, i'd say it's a tuning issue. Would there be any failing hardware that can also result in this way? Anyone that's experienced this before, I'd like to know what you're problem was and how you solved it.