Raw unburn fuel smell,need urgent help! golf mk3 1.4

[gor131-x]

hi guys

i have a mk3 golf 1.4 aex engine code.i have a 10+page thread on golfgtiforum and still stumped!heres' the link:

http://www.golfgtiforum.co.uk/index....pic=134402.120" onclick="window.open(this.href);return false;

basicly,the head gasket went,got another engine from scrappers,that was knackered,got another engine which sounds and runs fine,however a few problems:

1. there is a strong raw unburnt fuel smell coming from the crankcase breather hose,changed the throttle body,still no change,

2.the temperature needle drops to zero when i drive and goes to 90degrees when stationary,ive changed temp sensor and thermostat but stil the same

3.the radiator hoses get airlocked but when i unscrew the expansion tank cap,they go fine,however,upon driving the car again,they will become airlocked again.ive bought a new expansion tank and cap and still same problem.

its had a new lambda,temp sensor,thermostat,throttlebody,inlet manifold,new spark plugs,I AM ABSOLUTELY STUMPED

any input guys

thanks