I took my old plugs out an they were all suited up to fook so stuck some spare bosch super 4s in jus to see if it would start....an it did! but, took it a drive, came home and it wouldnt start again I'll take them out tommo and see if they're fouled up again, if so then I cant think why as theirs no reason it would be over fueling as AVA set it up (although 3yrs ago but its hardly moved since and started no prob up till now)