Rb25det Neo feels like it's jumping when I cruse.

[25RBGT]

I have a issue when ever I sit at a point on the peddle over 70kmph. It feels like it's jumping a little or slipping. Slip,grip,slip,grip ect only when I cruse if I give it a little or back off a little it stops.

Changed o2 sensor and plugs got spitfire coil packs nistune return flow cooler running 11psi stock everything else.

Any advice or thoughts please guys thank in advance

[tridentt150v]

fuel surge?  check your pump is ok?

Or missing and an injector is not flowing like it should all the time, might be sticking.

[V28VX37]

Also check fuel filter.

Busted CAS can be hairy too.

[25RBGT]

Got 1000cc injectors & 460 Walbro.
Going to unplug the o2 take it for a spin to make sure I didn't remove the busted one replace it with a dud.

Thanks I will check out all these things post what fixed it.

[25RBGT]

Still does it with o2 unplugged so that's not the issue.
Funny thing is if I back off or touch gas a tad more it also goes away. Just when I cruse

[89CAL]

Got a wideband or are you able to borrow one?
Stock ECU?

[25RBGT]

Nistune got a stagea rb25det in her

I maybe able to lend one

[75coupe]

Is it tuned for that engine and config?

[25RBGT]

Yep sure is tuned after.

Changed fuel filter,cleaned throttle body maf and air filter. Working on cleaning injectors now.
It's still there!!!

[tridentt150v]

Question is then.........is it fuel/spark related or a clutch/drivetrain issue? CV's, TPS, CAS, clutch, axle, diff - its hard to keyboard tune I think!

 

[25RBGT]

Very strange but I ran two bottles of injector cleaner threw it and it made it 'nearly' disappear.
So I'm pretty sure it's got something to do with fuel

[25RBGT]

Question is then.........is it fuel/spark related or a clutch/drivetrain issue? CV's, TPS, CAS, clutch, axle, diff - its hard to keyboard tune I think!
 

You said that may have been the issue way back. [emoji106]
I am swapping out the stock replacing with 1000cc mid next year. I'm pretty sure that will resolve the issue.

[25RBGT]

Finish off this thread, I put new tyres on rear a bit before never occurred to me months later when I noticed it. But today I rotated tyres got all rebalanced problem gone. I think someone mentioned tyres way back in thread.
Thanks guys