misfire when wet/moist

[conj323]

hi all im new to this forum
ive had the Williams for 2 years now, im 31 years old and always loved the look of the mk1 clio from when I was a kid then to find out they did a Williams I couldn't wait to get one
my Williams is number 323 and although she like to drink fuel I wouldn't change her for the world

I do have a problem with the running only on damp/wet days she misfires when at a constant rev, by constant I mean if I hold her at a steady rev she will miss but if I rev her from idle (1000) to any other rev not holding her at a particular rev she wont miss

ive changed
rota arm,dizzy cap, plugs, leads, crank sensor

I had a k&n filter on but when I put the standard air box back on it did seem to get a bit worst

im out of ideas now so if any one can help shed any light on what may be wrong that would be great

thank you

conj323

[p4cks]

is there any oil in the spark plug wells?

[Coops]

check the ecu in the scuttle panel for water ingress as well, and all the engine earth straps, particularly the on on the end of the gearbox to the inner wing

[Yanoo_]

+ check the TPS and lambda sensor wires.

[conj323]

yeah there is oil in the spark plug wells, not much but enough to stop water from the bonnet vent from getting in there

TPS?

[Yanoo_]

throttle position sensor

[conj323]

is that sensor red in colour has three wires, green, yellow and red coming out of it and is held in place with two Phillips screws
ive also checked the ecu and there is now water getting in there

[conj323]

is that sensor red in colour has three wires, green, yellow and red coming out of it and is held in place with two Phillips screws
ive also checked the ecu and there is now water getting in there

that was ment to be "NO" water not now