nah never valve bounced it

my 1st option was valve but if it was a valve it would allways idle rough

2day- get in car idleing rough, drive 2 mines perfect but everytime i stop idle rough, stop turnn it off.

start up 2 min later idel perfect & runs perfect

off-on, runs perfect

off-on runs perfect doe this 3/4 times

drove to dinner runing perfect, on way back stop at traffic lights & its running rough again

5/6 hrs later i go home & alls perfect again

valve cant be intermitant fault



my thoughts now are are:

may its a dodgy plug????
or
maybe lifter not opening vave on idle????? & when revved oil pressure rises & its ok???
& every now & then its ok??????

more inspection tomorrow

want 2 get it sorted so can take it classic ford sunday & run it up strip