vt ecotec twin throttle body problem

[wi1dvh]

hey all
i have a vt v6 5speed that i just put a twin throttle manifold on and now i am having some problems with it
i just got the heads rebuilt and put it all back to together and started it up and it idled perfect couldn't ask for a better idle did that 2 or 3 times then i dicided to take it for a drive and well took it for a drive up the road and back put in the drive idle was still fine then went to reverse back into the shed to have a check over for oil and coolant leaks and yeah it started to idle about 2000+rpm and i have the diagnostics test and the only code that came up was code 15 with is engine coolant temperature signal high anyway fixed that problem and did the diagnostics test again and the only code that came up was code 12 with is just to say the pcm is working fine
now i have diconnected thebattery a couple of times and started it again and itidles fine until it get to opperating temp then it idles high again
i have replaced the idle control valve with a new one and the tps and got another maf the only other thing i was thinking it could be is the vss (vehcile speed signal) because it is the only thing in the book that says anything about 1400+ idle

if anyone can help me that would be very great

thanks

[one_and_only2004]

Have you had it tuned? Twin throttle ecotecs will idle high every time without a tune.

We just discussed this oh..... 5 topics down from this one?

[wi1dvh]

no i havnt had it tuned yet
when i first started it after doing the heads it was idling fine but now it has just jumped up to nearly 3000rpm every time i start it

[johnno010684]

you CANT install and run a bigger/ttb without it being reprogrammed by your tuner.

[chevy_big_block_bro]

YES YOU CAN.......

I did it years ago on my old VT and it ran fine for almost 3 years on a stock tune.

You need to make sure that one TB is totally hooked up stock and the other is just a throttle blade with all lines blocked/welded up. Also make sure that the MAF is hooked up to both intakes with no leaks on the TB side.

Take it from someone thats been there, done that.