[Gab991210]

Just swap a GT TB to my GS, ECU reset, runs fine, no screaming noises, but the RPM drops really slow when below 2000rpm, also the RPM jumps a lot from 1000rpm -1500rpm when stopped.
Should I get a new gasket?
Any help is appreciated.

 

[Sabertooth^2]

Your throttle body scaling is now wrong. Idle control won't work right, and the car will hit maximum flow earlier in the throttle range, making it more twitchy but not faster.

Honestly, just undo it. Put a GS throttle body back on. A GS isn't anywhere near maxing out the flow without head work, and will absolutely need a tune to function right.

 

[Gab991210]

Oh sorry I forgot to mention, I was about to take it for a tune. Just wanna find a way to make it less disturbing when everytime I stop at a red light.
Anyway appreciate for the help

 

[Sabertooth^2]

Alright, then it'll be tuned and have a twitchier throttle until you scale it back, lol.

Make sure you port your intake manifold to match the larger throttle.