LS7 Idle problem

[ultimass]

The idle is playing up on my LS7. Recently at no particular time (it has never done it until the engine is properly warm) it 'sticks' at various levels - around 1500, 2000, 3000 rpm. After a while it will go back to normal(1000rpm)and then 'stick' again as it did this evening.

Even if you blip the throttle, it makes no difference.

When it is not idling properly, the engine is not as smooth and the pickup is poor.

I have checked the linkage and butterfly's to see if it is sticking anywhere, but all is ok.

The ECU is Motec.

Any ideas on what could be causing the problem?

Martin.

[ultimass]

Thanks for all the info.

I have checked as far as i can for leaks and hot spots etc. and everything seems fine.

not had the problem for a while then on Sunday it happened again twice.

spoke to the guy who mapped the car for me and he thinks it may be the throttle position sensor and advised me to replace it. i have taken it off but there is very little identification only a 'c' symbol in a circle (like a copyright symbol) and the numbers 1107. Can anyone identify it and where i can buy one from in the uk?

Thanks,
Martin.