need some help, i will run through the problem, the ute isnt running so good, i have a set of twin 45 webers on my a15, it is back firing, and coughing and spluttering. on the manifold there is like a pressure thing, and every now and then it lets a big burst of pressure off???, sounds like a BOV. the ute isnt idleing well either, it has done this b4, but stopped within 20minutes, but now it has stuck around for 2 days, i have noticed it doesnt happen when your reving that much, but when you take ya foot of the pedal it starts carrying on. anybody think they not wat the problem is. i havent had much experience with webers so any advice is much appreciated