CO Potentimeter set up (help needed)

[langersG40]

having some running issues with the G, drive fine but at 50-60mph it hesitants, and blackish smokes comes out the back when under full throttle for a few seconds, fall it hard up to 80ish and fine, at tick over its very lumpy, at first i thought it many have been a fault with the blue ECU sensor as i found a broken wire, so fixing that and also replaced the sensor for peace of mind. all was fine till this morning same thing happened
very lumpy so i played with the CO pot and managed to get a smooth idle, i took it out set it up on a muiti meter as per the guide on here first tried .550 ohmns ran like shit then .650 ohmns still the same, in the end i stuck it back on the car and ran it till i got a good smooth tick over pulled it back off and read the meter it was .950??? is my CO pot knackered

any help id be most gratful

cheers

Langers

[cheys03]

You've had to lean out the mixture a fair bit using the CO pot. Hayesey's written a very useful FAQ - I'd start there and begin eliminating things.

[cheys03]

http://www.polog40.co.uk/forum/index.php/topic,214.0.html