ECMlink Cruise Sway/Stutter

[Red 4G63]

Hey Guys,
So I've been battling this issue for a while, since installing the motor. If I'm trying to maintain speed cruising down the road at 35mph and the TPS is below 1v, the car will start to sway or stutter. If I push the throttle just a little bit (accelerate), the car smooths right out. I've ensured the TPS is adjusted, with just -1 'TPS adjust' because it will read .63v when off and .65v when running. I am working with a well-known tuner (won't say names and still in the process of tuning), but we are both pretty stumped on this specific issue. My signature should be up to date on all modifications/specifications. I have looked inside the ECU and nothing was leaking/smelled bad or noticeably wrong.

Couple of my theory's...
1 Possible 272/272 Cam overlap issue, causing low rpm issues (set to 0* on both Intake and Exhaust)
2 TPS starting to go bad (only happens under 1v)
3 Timing in the MaxOctTable at specific point of occurrence

Any insights would be much appreciated.

 

[motomattx]

Are you running gasoline or E85? I have ran into this myself on E85, I made some timing table adjustments to a large area of the cruising area, and it seemed to lessen it, I ran short of time last season to see how much it did for the problem, but I will pick up where I left off when the weather plays nice.

 

[Red 4G63]

Thanks for the response! I’m running 93oct. I didn’t want to mess with cleaning injectors every season. Besides, E85 is not as easy to find in NY. Only a couple of gas stations have good quality.

Please keep me posted on your progress. Did you increase the timing or decrease it in those areas?

Thanks!