1G not revving...

[Quint]

Only recently has my car begone to do this, when its cold (not stone cold but slightly below temperature) the car will refuse to rev past 1.5-2g rpm and will just hesitate splut and cough. Almost like bunny hopping.

I'm worried that the problem will occur when i pull out in front of someone and try to acclerate and have no juice. So anyone got ideas on whats causing this?

Engine is a 1G-GTE.

[hsmidy]

so whats it like when its at operating temp? sweet?

[Quint]

Yea, seems to run a treat. but i don't want to problem progressing so much that if the car varies in ANY temp it will freak out. and i'd love to know why its decided to do what its doing.

[mjrstar]

have you replaced anything lately like a temp sensor.
sounds like it's on the extra fuel cold start till it gets to full temp.
heres a possibility from left field but the heating element in the oxy sensor could have failed and is getting an incorrect signal until the engine has enough heat to heatsoak the oxy sensor.
as i said very left field but if you had a spare oxy sensor it could be an eay fix...
then again it could be something as simple a condensation under the dizzy car(it is winter after all) which dissipates once the engine has warmed up fully...
Good luck