[Hi all i have a prob my bug]

Hi all i have a prob my bug   has decided to play up it starts OK and execrates OK but coffs and spurts like hell when i coast / drive along in any gear i dont no anywhere around here near where i live at brize norton where they can tune my engine ,, it sounds like to much fuel going through the engine ,, i have had a look on line for said garages but to no av ale dose anyone no of anyone who can sort this much thanks rob     

Check the choke is off when running but itwill need a full engine tune. No idea on brize Area What engine and carbs ect. I am evesham so a bit of a distancep

As a starter, back to basics. Is the air filter/s clean. May be getting choked

It would be useful to know a bit more about your setup

Single or twin carb ?  Inlet rubber Air leaks?  Rotor arm and cap ok ?  Exhaust leaks?

hi all many thanks for getting back too me .. set up is twin web 35 carbs 1641 engine big boar electric ignition ... air filters are new, just serviced no electric fuel pump tried that didn't work ,, used to back fire if that helps   

Are you running a regulator between your mechanical fuel pump and the carbs?  The mechanical can push out too much pressure and flood them.

yes i have tried with it and with out it makes no difference

the reg is before the fuel pump

Remove your distributor, give mating surfaces a good clean, remove any paint. Refit and test.
I had a very similar problem, the car would start no problem, but once warming would start popping and hissing. Found electronic ignition needs a max' resistance <0.1 ohms. You can measure this between the battery earth terminal and advance plate of the distributor. I found paint was preventing the electronics working properly. Once clean all is good. Incidentally, you can fit points and a condenser. This set up isn't bothered about a decent earth.
Give it a go 
Paul

many thanks i have a new dizzy and roter arm new leads and spark plugs ,, battery voltage is spot on ,, i had it on the rolling road last year where it was all sorted but the gi who did this is no longer doing this any more i have had a word with a company  in Cambridge it costs me 250 just to get him down here http://cartune.uk/classic-car-tuning

So have I got this right? does it play up under light load, by this I mean at a constant speed in each gear? Or when you take your foot off the throttle?

Rob

constant speed in each gear

If it starts OK and accelerates OK, the problem is blocked idle jets!! Has it been left standing for a while? this causes the carbs to dry out leaving scaly deposits which blocks the idle jets and small passageways.

Rob

yes for a while i will look at the idle jets tomorrow many thanks i will let you no what happens tomorrow 

When you say  Weber 35's, are these single choke carb's; unlike the twin choke Weber IDF's or Dellorto DRLA's?  Sometimes just cleaning the idle jets works but most of the time, you have to clean the whole carburettor, blowing out all the passageways!

Rob