Hi all i have a prob could anyone help
my vectra when cold runs like a dream, when it gets to normal running temp it pulls back stutters and after a couple of mins i get error code p0301, misfire cylinder 1, and drops down to 3 cylinders, i have changed plugs even swapped them over, used live data and idle the fuel pressure is 700-730psi, under load it get as high as 1500psi, if i sit still and rev it never misses a beat just under load, fixed all the swirl flaps checked they move fine and work, and if i slowly build up once i get above 2500rpm it can take it to 6000 without it missin just just if i accel below that, it does it all the time.