Originally posted by gilee_8
Somehow whenever I use spark, the car will JERK like crazy when I get to like 3000RPM and ~70-90Kpa. it jerk so bad, it's not drivable. but as long as I keep the acceleration super slow and RPM low, I can go up to 50mph or so.

Hey, I went out for my first tuning drives today I am using spark, and having this EXACT same problem.

I took some datalogs, and just installed the viewer, and MSTweak. I'll see what I can figure out.